21404655522630 has 96 divisors (see below), whose sum is σ = 56631225081600. Its totient is φ = 5607608118336.

The previous prime is 21404655522619. The next prime is 21404655522667. The reversal of 21404655522630 is 3622555640412.

21404655522630 is a `hidden beast` number, since 2 + 1 + 4 + 0 + 4 + 6 + 5 + 5 + 5 + 2 + 2 + 630 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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, 7108047 + ... + 9660933.

It is an arithmetic number, because the mean of its divisors is an integer number (589908594600).

Almost surely, 2^{21404655522630} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21404655522630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28315612540800).

21404655522630 is an abundant number, since it is smaller than the sum of its proper divisors (35226569558970).

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

21404655522630 is a wasteful number, since it uses less digits than its factorization.

21404655522630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2554538 (or 2554535 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 45.

The spelling of 21404655522630 in words is "twenty-one trillion, four hundred four billion, six hundred fifty-five million, five hundred twenty-two thousand, six hundred thirty".