21133400144 has 40 divisors (see below), whose sum is σ = 43391050920. Its totient is φ = 9953484800.

The previous prime is 21133400107. The next prime is 21133400203. The reversal of 21133400144 is 44100433112.

It can be written as a sum of positive squares in 4 ways, for example, as 1220803600 + 19912596544 = 34940^2 + 141112^2 .

It is a congruent number.

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, 536417 + ... + 574464.

It is an arithmetic number, because the mean of its divisors is an integer number (1084776273).

Almost surely, 2^21133400144 is an apocalyptic number.

It is an amenable number.

21133400144 is an abundant number, since it is smaller than the sum of its proper divisors (22257650776).

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

21133400144 is a wasteful number, since it uses less digits than its factorization.

21133400144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110959 (or 1110953 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21133400144 its reverse (44100433112), we get a palindrome (65233833256).

The spelling of 21133400144 in words is "twenty-one billion, one hundred thirty-three million, four hundred thousand, one hundred forty-four".