21866010630 has 64 divisors (see below), whose sum is σ = 53064281088. Its totient is φ = 5765944320.

The previous prime is 21866010619. The next prime is 21866010637. The reversal of 21866010630 is 3601066812.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21866010591 and 21866010600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21866010637) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4569219 + ... + 4574001.

It is an arithmetic number, because the mean of its divisors is an integer number (829129392).

Almost surely, 2^21866010630 is an apocalyptic number.

21866010630 is an abundant number, since it is smaller than the sum of its proper divisors (31198270458).

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

21866010630 is a wasteful number, since it uses less digits than its factorization.

21866010630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6461.

The product of its (nonzero) digits is 10368, while the sum is 33.

The spelling of 21866010630 in words is "twenty-one billion, eight hundred sixty-six million, ten thousand, six hundred thirty".