21512542314534 has 16 divisors (see below), whose sum is σ = 45289562767680. Its totient is φ = 6793434415080.

The previous prime is 21512542314449. The next prime is 21512542314563. The reversal of 21512542314534 is 43541324521512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94353255652 + ... + 94353255879.

It is an arithmetic number, because the mean of its divisors is an integer number (2830597672980).

Almost surely, 2^{21512542314534} is an apocalyptic number.

21512542314534 is an abundant number, since it is smaller than the sum of its proper divisors (23777020453146).

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

21512542314534 is a wasteful number, since it uses less digits than its factorization.

21512542314534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188706511555.

The product of its digits is 576000, while the sum is 42.

The spelling of 21512542314534 in words is "twenty-one trillion, five hundred twelve billion, five hundred forty-two million, three hundred fourteen thousand, five hundred thirty-four".