21112333124 has 48 divisors (see below), whose sum is σ = 39236520960. Its totient is φ = 9925269120.

The previous prime is 21112333079. The next prime is 21112333127. The reversal of 21112333124 is 42133321112.

It is a self number, because there is not a number n which added to its sum of digits gives 21112333124.

It is not an unprimeable number, because it can be changed into a prime (21112333127) 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, 661322 + ... + 692510.

It is an arithmetic number, because the mean of its divisors is an integer number (817427520).

Almost surely, 2^21112333124 is an apocalyptic number.

It is an amenable number.

21112333124 is a deficient number, since it is larger than the sum of its proper divisors (18124187836).

21112333124 is a wasteful number, since it uses less digits than its factorization.

21112333124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31380 (or 31378 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

Adding to 21112333124 its reverse (42133321112), we get a palindrome (63245654236).

The spelling of 21112333124 in words is "twenty-one billion, one hundred twelve million, three hundred thirty-three thousand, one hundred twenty-four".