9921295881 has 32 divisors (see below), whose sum is σ = 17048698880. Its totient is φ = 5584688208.

The previous prime is 9921295861. The next prime is 9921295889. The reversal of 9921295881 is 1885921299.

It is not a de Polignac number, because 9921295881 - 2⁵ = 9921295849 is a prime.

It is a super-2 number, since 2×9921295881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9921295889) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 379081 + ... + 404406.

It is an arithmetic number, because the mean of its divisors is an integer number (532771840).

Almost surely, 2^9921295881 is an apocalyptic number.

It is an amenable number.

9921295881 is a deficient number, since it is larger than the sum of its proper divisors (7127402999).

9921295881 is a wasteful number, since it uses less digits than its factorization.

9921295881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783570 (or 783564 counting only the distinct ones).

The product of its digits is 933120, while the sum is 54.

The square root of 9921295881 is about 99605.7020506356. The cubic root of 9921295881 is about 2148.7677006056.

The spelling of 9921295881 in words is "nine billion, nine hundred twenty-one million, two hundred ninety-five thousand, eight hundred eighty-one".