21385762136 has 32 divisors (see below), whose sum is σ = 42468416640. Its totient is φ = 10061188608.

The previous prime is 21385762133. The next prime is 21385762147. The reversal of 21385762136 is 63126758312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21385762133) 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, 543065 + ... + 581111.

It is an arithmetic number, because the mean of its divisors is an integer number (1327138020).

Almost surely, 2^21385762136 is an apocalyptic number.

It is an amenable number.

21385762136 is a deficient number, since it is larger than the sum of its proper divisors (21082654504).

21385762136 is a wasteful number, since it uses less digits than its factorization.

21385762136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42203 (or 42199 counting only the distinct ones).

The product of its digits is 362880, while the sum is 44.

The spelling of 21385762136 in words is "twenty-one billion, three hundred eighty-five million, seven hundred sixty-two thousand, one hundred thirty-six".