9621158421 has 16 divisors (see below), whose sum is σ = 15432435200. Its totient is φ = 5208446448.

The previous prime is 9621158401. The next prime is 9621158429. The reversal of 9621158421 is 1248511269.

It is not a de Polignac number, because 9621158421 - 2¹⁸ = 9620896277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9621158421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9621158429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12056191 + ... + 12056988.

It is an arithmetic number, because the mean of its divisors is an integer number (964527200).

Almost surely, 2^9621158421 is an apocalyptic number.

It is an amenable number.

9621158421 is a deficient number, since it is larger than the sum of its proper divisors (5811276779).

9621158421 is a wasteful number, since it uses less digits than its factorization.

9621158421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24113208.

The product of its digits is 34560, while the sum is 39.

The square root of 9621158421 is about 98087.5038983050. The cubic root of 9621158421 is about 2126.8773938645.

The spelling of 9621158421 in words is "nine billion, six hundred twenty-one million, one hundred fifty-eight thousand, four hundred twenty-one".