21004022331 has 8 divisors (see below), whose sum is σ = 31117070160. Its totient is φ = 14002681536.

The previous prime is 21004022327. The next prime is 21004022383. The reversal of 21004022331 is 13322040012.

21004022331 is a `hidden beast` number, since 210 + 0 + 402 + 23 + 31 = 666.

It is not a de Polignac number, because 21004022331 - 2² = 21004022327 is a prime.

It is a super-2 number, since 2×21004022331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21004022731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388963350 + ... + 388963403.

It is an arithmetic number, because the mean of its divisors is an integer number (3889633770).

Almost surely, 2^21004022331 is an apocalyptic number.

21004022331 is a deficient number, since it is larger than the sum of its proper divisors (10113047829).

21004022331 is an equidigital number, since it uses as much as digits as its factorization.

21004022331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777926762 (or 777926756 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21004022331 its reverse (13322040012), we get a palindrome (34326062343).

The spelling of 21004022331 in words is "twenty-one billion, four million, twenty-two thousand, three hundred thirty-one".