21537462155 has 24 divisors (see below), whose sum is σ = 29101004352. Its totient is φ = 15281552000.

The previous prime is 21537462139. The next prime is 21537462241. The reversal of 21537462155 is 55126473512.

It is not a de Polignac number, because 21537462155 - 2⁴ = 21537462139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 409331 + ... + 458940.

It is an arithmetic number, because the mean of its divisors is an integer number (1212541848).

Almost surely, 2^21537462155 is an apocalyptic number.

21537462155 is a deficient number, since it is larger than the sum of its proper divisors (7563542197).

21537462155 is a wasteful number, since it uses less digits than its factorization.

21537462155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868339 (or 868328 counting only the distinct ones).

The product of its digits is 252000, while the sum is 41.

The spelling of 21537462155 in words is "twenty-one billion, five hundred thirty-seven million, four hundred sixty-two thousand, one hundred fifty-five".