21274512142 has 16 divisors (see below), whose sum is σ = 34408311840. Its totient is φ = 9807064992.

The previous prime is 21274512131. The next prime is 21274512187. The reversal of 21274512142 is 24121547212.

It is a congruent 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, 475717 + ... + 518512.

It is an arithmetic number, because the mean of its divisors is an integer number (2150519490).

Almost surely, 2^21274512142 is an apocalyptic number.

21274512142 is a deficient number, since it is larger than the sum of its proper divisors (13133799698).

21274512142 is a wasteful number, since it uses less digits than its factorization.

21274512142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 995067.

The product of its digits is 8960, while the sum is 31.

The spelling of 21274512142 in words is "twenty-one billion, two hundred seventy-four million, five hundred twelve thousand, one hundred forty-two".