21216546262542 has 16 divisors (see below), whose sum is σ = 44278009591680. Its totient is φ = 6764695909752.

The previous prime is 21216546262493. The next prime is 21216546262589. The reversal of 21216546262542 is 24526264561212.

It is a junction number, because it is equal to n+sod(n) for n = 21216546262491 and 21216546262500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76871544292 + ... + 76871544567.

It is an arithmetic number, because the mean of its divisors is an integer number (2767375599480).

Almost surely, 2^{21216546262542} is an apocalyptic number.

21216546262542 is an abundant number, since it is smaller than the sum of its proper divisors (23061463329138).

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

21216546262542 is a wasteful number, since it uses less digits than its factorization.

21216546262542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153743088887.

The product of its digits is 2764800, while the sum is 48.

The spelling of 21216546262542 in words is "twenty-one trillion, two hundred sixteen billion, five hundred forty-six million, two hundred sixty-two thousand, five hundred forty-two".