21142656354 has 16 divisors (see below), whose sum is σ = 42293090592. Its totient is φ = 7046255808.

The previous prime is 21142656349. The next prime is 21142656371. The reversal of 21142656354 is 45365624112.

It is a Curzon number.

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, 288439 + ... + 354234.

It is an arithmetic number, because the mean of its divisors is an integer number (2643318162).

Almost surely, 2^21142656354 is an apocalyptic number.

21142656354 is an abundant number, since it is smaller than the sum of its proper divisors (21150434238).

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

21142656354 is a wasteful number, since it uses less digits than its factorization.

21142656354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648161.

The product of its digits is 172800, while the sum is 39.

The spelling of 21142656354 in words is "twenty-one billion, one hundred forty-two million, six hundred fifty-six thousand, three hundred fifty-four".