21142542312 has 48 divisors (see below), whose sum is σ = 57447630240. Its totient is φ = 7024550688.

The previous prime is 21142542299. The next prime is 21142542313. The reversal of 21142542312 is 21324524112.

21142542312 is a `hidden beast` number, since 2 + 1 + 1 + 425 + 4 + 231 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (21142542313) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 456148 + ... + 500355.

It is an arithmetic number, because the mean of its divisors is an integer number (1196825630).

Almost surely, 2^21142542312 is an apocalyptic number.

It is an amenable number.

21142542312 is an abundant number, since it is smaller than the sum of its proper divisors (36305087928).

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

21142542312 is a wasteful number, since it uses less digits than its factorization.

21142542312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956822 (or 956815 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The spelling of 21142542312 in words is "twenty-one billion, one hundred forty-two million, five hundred forty-two thousand, three hundred twelve".