21662581292 has 24 divisors (see below), whose sum is σ = 41364972432. Its totient is φ = 9844452800.

The previous prime is 21662581289. The next prime is 21662581307. The reversal of 21662581292 is 29218526612.

It is a Harshad number since it is a multiple of its sum of digits (44).

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 7 ways as a sum of consecutive naturals, for example, 156242 + ... + 260262.

It is an arithmetic number, because the mean of its divisors is an integer number (1723540518).

Almost surely, 2^21662581292 is an apocalyptic number.

21662581292 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21662581292 is a deficient number, since it is larger than the sum of its proper divisors (19702391140).

21662581292 is a wasteful number, since it uses less digits than its factorization.

21662581292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108769 (or 108767 counting only the distinct ones).

The product of its digits is 207360, while the sum is 44.

The spelling of 21662581292 in words is "twenty-one billion, six hundred sixty-two million, five hundred eighty-one thousand, two hundred ninety-two".