21561650022 has 32 divisors (see below), whose sum is σ = 47050819200. Its totient is φ = 6532830720.

The previous prime is 21561650009. The next prime is 21561650029. The reversal of 21561650022 is 22005616512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21561650029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 486918 + ... + 529350.

It is an arithmetic number, because the mean of its divisors is an integer number (1470338100).

Almost surely, 2^21561650022 is an apocalyptic number.

21561650022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21561650022 is an abundant number, since it is smaller than the sum of its proper divisors (25489169178).

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

21561650022 is a wasteful number, since it uses less digits than its factorization.

21561650022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50148.

The product of its (nonzero) digits is 7200, while the sum is 30.

The spelling of 21561650022 in words is "twenty-one billion, five hundred sixty-one million, six hundred fifty thousand, twenty-two".