9954201621 has 32 divisors (see below), whose sum is σ = 16412612608. Its totient is φ = 5225653440.

The previous prime is 9954201563. The next prime is 9954201629. The reversal of 9954201621 is 1261024599.

9954201621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9954201621 - 2⁶ = 9954201557 is a prime.

It is a super-2 number, since 2×9954201621² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 9954201621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9954201629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28801 + ... + 144006.

It is an arithmetic number, because the mean of its divisors is an integer number (512894144).

Almost surely, 2^9954201621 is an apocalyptic number.

9954201621 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

9954201621 is the 57603-rd octagonal number.

It is an amenable number.

9954201621 is a deficient number, since it is larger than the sum of its proper divisors (6458410987).

9954201621 is a wasteful number, since it uses less digits than its factorization.

9954201621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173041.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 9954201621 is about 99770.7453164504. The cubic root of 9954201621 is about 2151.1406689926.

It can be divided in two parts, 9954 and 201621, that added together give a triangular number (211575 = T₆₅₀).

The spelling of 9954201621 in words is "nine billion, nine hundred fifty-four million, two hundred one thousand, six hundred twenty-one".