21146555054536 has 128 divisors (see below), whose sum is σ = 43051152775680. Its totient is φ = 9699730292736.

The previous prime is 21146555054531. The next prime is 21146555054563. The reversal of 21146555054536 is 63545055564112.

It is not an unprimeable number, because it can be changed into a prime (21146555054531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1924683235 + ... + 1924694221.

It is an arithmetic number, because the mean of its divisors is an integer number (336337131060).

Almost surely, 2^{21146555054536} is an apocalyptic number.

It is an amenable number.

21146555054536 is an abundant number, since it is smaller than the sum of its proper divisors (21904597721144).

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

21146555054536 is a wasteful number, since it uses less digits than its factorization.

21146555054536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12263 (or 12259 counting only the distinct ones).

The product of its (nonzero) digits is 10800000, while the sum is 52.

The spelling of 21146555054536 in words is "twenty-one trillion, one hundred forty-six billion, five hundred fifty-five million, fifty-four thousand, five hundred thirty-six".