21398425936 has 40 divisors (see below), whose sum is σ = 43674436800. Its totient is φ = 10128453120.

The previous prime is 21398425931. The next prime is 21398425987. The reversal of 21398425936 is 63952489312.

It is a super-3 number, since 3×21398425936³ (a number of 32 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21398425931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 387885 + ... + 439603.

It is an arithmetic number, because the mean of its divisors is an integer number (1091860920).

Almost surely, 2^21398425936 is an apocalyptic number.

It is an amenable number.

21398425936 is an abundant number, since it is smaller than the sum of its proper divisors (22276010864).

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

21398425936 is a wasteful number, since it uses less digits than its factorization.

21398425936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53107 (or 53101 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 52.

The spelling of 21398425936 in words is "twenty-one billion, three hundred ninety-eight million, four hundred twenty-five thousand, nine hundred thirty-six".