21654222633708 has 144 divisors (see below), whose sum is σ = 61527172815360. Its totient is φ = 5899015938816.

The previous prime is 21654222633649. The next prime is 21654222633773. The reversal of 21654222633708 is 80733622245612.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1675233 + ... + 6790791.

It is an arithmetic number, because the mean of its divisors is an integer number (427272033440).

Almost surely, 2^{21654222633708} is an apocalyptic number.

21654222633708 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21654222633708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30763586407680).

21654222633708 is an abundant number, since it is smaller than the sum of its proper divisors (39872950181652).

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

21654222633708 is a wasteful number, since it uses less digits than its factorization.

21654222633708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5115916 (or 5115907 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 51.

The spelling of 21654222633708 in words is "twenty-one trillion, six hundred fifty-four billion, two hundred twenty-two million, six hundred thirty-three thousand, seven hundred eight".