21154546421516 has 12 divisors (see below), whose sum is σ = 38630041291632. Its totient is φ = 10117391766768.

The previous prime is 21154546421413. The next prime is 21154546421549. The reversal of 21154546421516 is 61512464545112.

It is a super-2 number, since 2×21154546421516² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114970360895 + ... + 114970361078.

It is an arithmetic number, because the mean of its divisors is an integer number (3219170107636).

Almost surely, 2^{21154546421516} is an apocalyptic number.

It is an amenable number.

21154546421516 is a deficient number, since it is larger than the sum of its proper divisors (17475494870116).

21154546421516 is a wasteful number, since it uses less digits than its factorization.

21154546421516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229940722000 (or 229940721998 counting only the distinct ones).

The product of its digits is 1152000, while the sum is 47.

The spelling of 21154546421516 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred forty-six million, four hundred twenty-one thousand, five hundred sixteen".