9921395932 has 72 divisors (see below), whose sum is σ = 20928290544. Its totient is φ = 4100156928.

The previous prime is 9921395903. The next prime is 9921396007. The reversal of 9921395932 is 2395931299.

It is a happy number.

It is a super-2 number, since 2×9921395932² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9921395932.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 813423 + ... + 825529.

It is an arithmetic number, because the mean of its divisors is an integer number (290670702).

Almost surely, 2^9921395932 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9921395932, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10464145272).

9921395932 is an abundant number, since it is smaller than the sum of its proper divisors (11006894612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9921395932 is a wasteful number, since it uses less digits than its factorization.

9921395932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12275 (or 12266 counting only the distinct ones).

The product of its digits is 1180980, while the sum is 52.

The square root of 9921395932 is about 99606.2042846730. The cubic root of 9921395932 is about 2148.7749236417.

The spelling of 9921395932 in words is "nine billion, nine hundred twenty-one million, three hundred ninety-five thousand, nine hundred thirty-two".