21654601425516 has 192 divisors, whose sum is σ = 52500952627200. Its totient is φ = 6943804268544.

The previous prime is 21654601425497. The next prime is 21654601425571. The reversal of 21654601425516 is 61552410645612.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2617498756 + ... + 2617507028.

It is an arithmetic number, because the mean of its divisors is an integer number (273442461600).

Almost surely, 2^{21654601425516} is an apocalyptic number.

It is an amenable number.

21654601425516 is an abundant number, since it is smaller than the sum of its proper divisors (30846351201684).

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

21654601425516 is a wasteful number, since it uses less digits than its factorization.

21654601425516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8888 (or 8886 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 48.

The spelling of 21654601425516 in words is "twenty-one trillion, six hundred fifty-four billion, six hundred one million, four hundred twenty-five thousand, five hundred sixteen".