21655416105210 has 16 divisors (see below), whose sum is σ = 51972998652576. Its totient is φ = 5774777628048.

The previous prime is 21655416105199. The next prime is 21655416105251. The reversal of 21655416105210 is 1250161455612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360923601724 + ... + 360923601783.

It is an arithmetic number, because the mean of its divisors is an integer number (3248312415786).

Almost surely, 2^{21655416105210} is an apocalyptic number.

21655416105210 is an abundant number, since it is smaller than the sum of its proper divisors (30317582547366).

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

21655416105210 is a wasteful number, since it uses less digits than its factorization.

21655416105210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721847203517.

The product of its (nonzero) digits is 72000, while the sum is 39.

The spelling of 21655416105210 in words is "twenty-one trillion, six hundred fifty-five billion, four hundred sixteen million, one hundred five thousand, two hundred ten".