21655142322 has 32 divisors (see below), whose sum is σ = 47252980800. Its totient is φ = 6561414720.

The previous prime is 21655142303. The next prime is 21655142347. The reversal of 21655142322 is 22324155612.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 907804 + ... + 931352.

It is an arithmetic number, because the mean of its divisors is an integer number (1476655650).

Almost surely, 2^21655142322 is an apocalyptic number.

21655142322 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21655142322 is an abundant number, since it is smaller than the sum of its proper divisors (25597838478).

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

21655142322 is a wasteful number, since it uses less digits than its factorization.

21655142322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37498.

The product of its digits is 28800, while the sum is 33.

Adding to 21655142322 its reverse (22324155612), we get a palindrome (43979297934).

The spelling of 21655142322 in words is "twenty-one billion, six hundred fifty-five million, one hundred forty-two thousand, three hundred twenty-two".