21023321238 has 48 divisors (see below), whose sum is σ = 46489135680. Its totient is φ = 6864544368.

The previous prime is 21023321237. The next prime is 21023321273. The reversal of 21023321238 is 83212332012.

It is a happy number.

21023321238 is a `hidden beast` number, since 2 + 102 + 3 + 321 + 238 = 666.

It is a super-2 number, since 2×21023321238² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023321237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 167181 + ... + 264567.

It is an arithmetic number, because the mean of its divisors is an integer number (968523660).

Almost surely, 2^21023321238 is an apocalyptic number.

21023321238 is an abundant number, since it is smaller than the sum of its proper divisors (25465814442).

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

21023321238 is a wasteful number, since it uses less digits than its factorization.

21023321238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97641 (or 97638 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The spelling of 21023321238 in words is "twenty-one billion, twenty-three million, three hundred twenty-one thousand, two hundred thirty-eight".