21650621060 has 48 divisors (see below), whose sum is σ = 47049856560. Its totient is φ = 8358819840.

The previous prime is 21650621051. The next prime is 21650621093. The reversal of 21650621060 is 6012605612.

It can be written as a sum of positive squares in 8 ways, for example, as 1119170116 + 20531450944 = 33454^2 + 143288^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2859680 + ... + 2867240.

It is an arithmetic number, because the mean of its divisors is an integer number (980205345).

Almost surely, 2^21650621060 is an apocalyptic number.

21650621060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21650621060 is an abundant number, since it is smaller than the sum of its proper divisors (25399235500).

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

21650621060 is a wasteful number, since it uses less digits than its factorization.

21650621060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12536 (or 12534 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 21650621060 in words is "twenty-one billion, six hundred fifty million, six hundred twenty-one thousand, sixty".