21214036610556 has 48 divisors (see below), whose sum is σ = 50281243423488. Its totient is φ = 6959992211200.

The previous prime is 21214036610539. The next prime is 21214036610609. The reversal of 21214036610556 is 65501663041212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20488950 + ... + 21499421.

It is an arithmetic number, because the mean of its divisors is an integer number (1047525904656).

Almost surely, 2^{21214036610556} is an apocalyptic number.

It is an amenable number.

21214036610556 is an abundant number, since it is smaller than the sum of its proper divisors (29067206812932).

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

21214036610556 is a wasteful number, since it uses less digits than its factorization.

21214036610556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41989042 (or 41989040 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 42.

Adding to 21214036610556 its reverse (65501663041212), we get a palindrome (86715699651768).

The spelling of 21214036610556 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, six hundred ten thousand, five hundred fifty-six".