21540201535534 has 32 divisors (see below), whose sum is σ = 35598080973312. Its totient is φ = 9693653700000.

The previous prime is 21540201535511. The next prime is 21540201535661. The reversal of 21540201535534 is 43553510204512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56352759 + ... + 56733709.

It is an arithmetic number, because the mean of its divisors is an integer number (1112440030416).

Almost surely, 2^{21540201535534} is an apocalyptic number.

21540201535534 is a deficient number, since it is larger than the sum of its proper divisors (14057879437778).

21540201535534 is a wasteful number, since it uses less digits than its factorization.

21540201535534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406512.

The product of its (nonzero) digits is 360000, while the sum is 40.

The spelling of 21540201535534 in words is "twenty-one trillion, five hundred forty billion, two hundred one million, five hundred thirty-five thousand, five hundred thirty-four".