21776630652 has 144 divisors (see below), whose sum is σ = 66028015872. Its totient is φ = 6146772480.

The previous prime is 21776630639. The next prime is 21776630699. The reversal of 21776630652 is 25603667712.

21776630652 is a `hidden beast` number, since 2 + 1 + 7 + 7 + 6 + 630 + 6 + 5 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21776630598 and 21776630607.

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, 545452 + ... + 584012.

It is an arithmetic number, because the mean of its divisors is an integer number (458527888).

Almost surely, 2^21776630652 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21776630652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33014007936).

21776630652 is an abundant number, since it is smaller than the sum of its proper divisors (44251385220).

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

21776630652 is a wasteful number, since it uses less digits than its factorization.

21776630652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38670 (or 38656 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 45.

The spelling of 21776630652 in words is "twenty-one billion, seven hundred seventy-six million, six hundred thirty thousand, six hundred fifty-two".