21354138156 has 24 divisors (see below), whose sum is σ = 53659116784. Its totient is φ = 6570504000.

The previous prime is 21354138131. The next prime is 21354138167. The reversal of 21354138156 is 65183145312.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 68442595 + ... + 68442906.

Almost surely, 2^21354138156 is an apocalyptic number.

21354138156 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21354138156 is an abundant number, since it is smaller than the sum of its proper divisors (32304978628).

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

21354138156 is a wasteful number, since it uses less digits than its factorization.

21354138156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136885521 (or 136885519 counting only the distinct ones).

The product of its digits is 86400, while the sum is 39.

The spelling of 21354138156 in words is "twenty-one billion, three hundred fifty-four million, one hundred thirty-eight thousand, one hundred fifty-six".