21931122122 has 32 divisors (see below), whose sum is σ = 40580601600. Its totient is φ = 8656253568.

The previous prime is 21931122091. The next prime is 21931122133. The reversal of 21931122122 is 22122113912.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 21931122091 and 21931122100.

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, 57347 + ... + 217142.

It is an arithmetic number, because the mean of its divisors is an integer number (1268143800).

Almost surely, 2^21931122122 is an apocalyptic number.

21931122122 is a deficient number, since it is larger than the sum of its proper divisors (18649479478).

21931122122 is a wasteful number, since it uses less digits than its factorization.

21931122122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274950.

The product of its digits is 864, while the sum is 26.

The spelling of 21931122122 in words is "twenty-one billion, nine hundred thirty-one million, one hundred twenty-two thousand, one hundred twenty-two".