21379501936 has 40 divisors (see below), whose sum is σ = 46957011920. Its totient is φ = 9348120576.

The previous prime is 21379501933. The next prime is 21379501967. The reversal of 21379501936 is 63910597312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21379501931) 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, 2700945 + ... + 2708848.

It is an arithmetic number, because the mean of its divisors is an integer number (1173925298).

Almost surely, 2^21379501936 is an apocalyptic number.

21379501936 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21379501936 is an abundant number, since it is smaller than the sum of its proper divisors (25577509984).

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

21379501936 is a wasteful number, since it uses less digits than its factorization.

21379501936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5409833 (or 5409827 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 46.

The spelling of 21379501936 in words is "twenty-one billion, three hundred seventy-nine million, five hundred one thousand, nine hundred thirty-six".