21154535621060 has 48 divisors (see below), whose sum is σ = 44474899053312. Its totient is φ = 8452221859200.

The previous prime is 21154535620963. The next prime is 21154535621077. The reversal of 21154535621060 is 6012653545112.

It is a junction number, because it is equal to n+sod(n) for n = 21154535620999 and 21154535621017.

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, 130711790 + ... + 130873530.

It is an arithmetic number, because the mean of its divisors is an integer number (926560396944).

Almost surely, 2^{21154535621060} is an apocalyptic number.

21154535621060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21154535621060 is an abundant number, since it is smaller than the sum of its proper divisors (23320363432252).

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

21154535621060 is a wasteful number, since it uses less digits than its factorization.

21154535621060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169124 (or 169122 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 21154535621060 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred thirty-five million, six hundred twenty-one thousand, sixty".