21133113344 has 48 divisors (see below), whose sum is σ = 48292498800. Its totient is φ = 9057042432.

The previous prime is 21133113307. The next prime is 21133113367. The reversal of 21133113344 is 44331133112.

It is a super-2 number, since 2×21133113344² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 722729 + ... + 751400.

It is an arithmetic number, because the mean of its divisors is an integer number (1006093725).

Almost surely, 2^21133113344 is an apocalyptic number.

It is an amenable number.

21133113344 is an abundant number, since it is smaller than the sum of its proper divisors (27159385456).

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

21133113344 is an equidigital number, since it uses as much as digits as its factorization.

21133113344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1474158 (or 1474138 counting only the distinct ones).

The product of its digits is 2592, while the sum is 26.

Adding to 21133113344 its reverse (44331133112), we get a palindrome (65464246456).

The spelling of 21133113344 in words is "twenty-one billion, one hundred thirty-three million, one hundred thirteen thousand, three hundred forty-four".