9621009621 has 24 divisors (see below), whose sum is σ = 14049155640. Its totient is φ = 6343920000.

The previous prime is 9621009617. The next prime is 9621009623. The reversal of 9621009621 is 1269001269.

9621009621 is a `hidden beast` number, since 9 + 6 + 21 + 0 + 0 + 9 + 621 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6470432721 + 3150576900 = 80439^2 + 56130^2 .

It is not a de Polignac number, because 9621009621 - 2² = 9621009617 is a prime.

It is a super-2 number, since 2×9621009621² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9621009623) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 966771 + ... + 976671.

It is an arithmetic number, because the mean of its divisors is an integer number (585381485).

Almost surely, 2^9621009621 is an apocalyptic number.

It is an amenable number.

9621009621 is a deficient number, since it is larger than the sum of its proper divisors (4428146019).

9621009621 is a wasteful number, since it uses less digits than its factorization.

9621009621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11077 (or 11074 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 9621009621 is about 98086.7453889668. The cubic root of 9621009621 is about 2126.8664291077.

It can be divided in two parts, 962100 and 9621, that multiplied together give a square (9256364100 = 96210²).

The spelling of 9621009621 in words is "nine billion, six hundred twenty-one million, nine thousand, six hundred twenty-one".