21601667630154 has 64 divisors (see below), whose sum is σ = 43390820632320. Its totient is φ = 7169393825280.

The previous prime is 21601667630063. The next prime is 21601667630161. The reversal of 21601667630154 is 45103676610612.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2790548724 + ... + 2790556464.

It is an arithmetic number, because the mean of its divisors is an integer number (677981572380).

Almost surely, 2^{21601667630154} is an apocalyptic number.

21601667630154 is an abundant number, since it is smaller than the sum of its proper divisors (21789153002166).

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

21601667630154 is a wasteful number, since it uses less digits than its factorization.

21601667630154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10255.

The product of its (nonzero) digits is 1088640, while the sum is 48.

The spelling of 21601667630154 in words is "twenty-one trillion, six hundred one billion, six hundred sixty-seven million, six hundred thirty thousand, one hundred fifty-four".