21542306512 has 20 divisors (see below), whose sum is σ = 41827608576. Its totient is φ = 10748084960.

The previous prime is 21542306491. The next prime is 21542306581. The reversal of 21542306512 is 21560324512.

It is a super-2 number, since 2×21542306512² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1434064 + ... + 1449007.

Almost surely, 2^21542306512 is an apocalyptic number.

It is an amenable number.

21542306512 is a deficient number, since it is larger than the sum of its proper divisors (20285302064).

21542306512 is a wasteful number, since it uses less digits than its factorization.

21542306512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2883546 (or 2883540 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The spelling of 21542306512 in words is "twenty-one billion, five hundred forty-two million, three hundred six thousand, five hundred twelve".