21537462154 has 16 divisors (see below), whose sum is σ = 36303950592. Its totient is φ = 9508177008.

The previous prime is 21537462139. The next prime is 21537462241. The reversal of 21537462154 is 45126473512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18007314 + ... + 18008509.

It is an arithmetic number, because the mean of its divisors is an integer number (2268996912).

Almost surely, 2^21537462154 is an apocalyptic number.

21537462154 is a deficient number, since it is larger than the sum of its proper divisors (14766488438).

21537462154 is a wasteful number, since it uses less digits than its factorization.

21537462154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36015861.

The product of its digits is 201600, while the sum is 40.

The spelling of 21537462154 in words is "twenty-one billion, five hundred thirty-seven million, four hundred sixty-two thousand, one hundred fifty-four".