21121323244 has 48 divisors (see below), whose sum is σ = 42542337600. Its totient is φ = 8987959296.

The previous prime is 21121323227. The next prime is 21121323259. The reversal of 21121323244 is 44232312112.

It is a super-2 number, since 2×21121323244² (a number of 21 digits) contains 22 as substring.

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, 3071442 + ... + 3078310.

It is an arithmetic number, because the mean of its divisors is an integer number (886298700).

Almost surely, 2^21121323244 is an apocalyptic number.

It is an amenable number.

21121323244 is an abundant number, since it is smaller than the sum of its proper divisors (21421014356).

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

21121323244 is a wasteful number, since it uses less digits than its factorization.

21121323244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7642 (or 7640 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

Adding to 21121323244 its reverse (44232312112), we get a palindrome (65353635356).

The spelling of 21121323244 in words is "twenty-one billion, one hundred twenty-one million, three hundred twenty-three thousand, two hundred forty-four".