21331302124 has 24 divisors (see below), whose sum is σ = 41589854208. Its totient is φ = 9489746640.

The previous prime is 21331302119. The next prime is 21331302169. The reversal of 21331302124 is 42120313312.

It is a super-2 number, since 2×21331302124² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21331302095 and 21331302104.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5155404 + ... + 5159539.

It is an arithmetic number, because the mean of its divisors is an integer number (1732910592).

Almost surely, 2^21331302124 is an apocalyptic number.

It is an amenable number.

21331302124 is a deficient number, since it is larger than the sum of its proper divisors (20258552084).

21331302124 is a wasteful number, since it uses less digits than its factorization.

21331302124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10315005 (or 10315003 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21331302124 its reverse (42120313312), we get a palindrome (63451615436).

The spelling of 21331302124 in words is "twenty-one billion, three hundred thirty-one million, three hundred two thousand, one hundred twenty-four".