21655103123610 has 192 divisors, whose sum is σ = 63480890551680. Its totient is φ = 5249144736000.

The previous prime is 21655103123609. The next prime is 21655103123623. The reversal of 21655103123610 is 1632130155612.

21655103123610 is a `hidden beast` number, since 2 + 1 + 6 + 5 + 5 + 1 + 0 + 31 + 2 + 3 + 610 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 347937054 + ... + 347999286.

It is an arithmetic number, because the mean of its divisors is an integer number (330629638290).

Almost surely, 2^{21655103123610} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21655103123610, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31740445275840).

21655103123610 is an abundant number, since it is smaller than the sum of its proper divisors (41825787428070).

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

21655103123610 is a wasteful number, since it uses less digits than its factorization.

21655103123610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72922 (or 72905 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 21655103123610 in words is "twenty-one trillion, six hundred fifty-five billion, one hundred three million, one hundred twenty-three thousand, six hundred ten".