9964082921 has 4 divisors (see below), whose sum is σ = 10730550852. Its totient is φ = 9197614992.

The previous prime is 9964082917. The next prime is 9964082927. The reversal of 9964082921 is 1292804699.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1960275625 + 8003807296 = 44275^2 + 89464^2 .

It is a cyclic number.

It is not a de Polignac number, because 9964082921 - 2² = 9964082917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 9964082921.

It is not an unprimeable number, because it can be changed into a prime (9964082927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383233946 + ... + 383233971.

It is an arithmetic number, because the mean of its divisors is an integer number (2682637713).

Almost surely, 2^9964082921 is an apocalyptic number.

It is an amenable number.

9964082921 is a deficient number, since it is larger than the sum of its proper divisors (766467931).

9964082921 is a wasteful number, since it uses less digits than its factorization.

9964082921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766467930.

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 9964082921 is about 99820.2530601881. The cubic root of 9964082921 is about 2151.8522290458.

The spelling of 9964082921 in words is "nine billion, nine hundred sixty-four million, eighty-two thousand, nine hundred twenty-one".