21132123044 has 6 divisors (see below), whose sum is σ = 36981215334. Its totient is φ = 10566061520.

The previous prime is 21132123017. The next prime is 21132123073. The reversal of 21132123044 is 44032123112.

It can be written as a sum of positive squares in only one way, i.e., 16628102500 + 4504020544 = 128950^2 + 67112^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2641515377 + ... + 2641515384.

It is an arithmetic number, because the mean of its divisors is an integer number (6163535889).

Almost surely, 2^21132123044 is an apocalyptic number.

It is an amenable number.

21132123044 is a deficient number, since it is larger than the sum of its proper divisors (15849092290).

21132123044 is a wasteful number, since it uses less digits than its factorization.

21132123044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5283030765 (or 5283030763 counting only the distinct ones).

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

Adding to 21132123044 its reverse (44032123112), we get a palindrome (65164246156).

The spelling of 21132123044 in words is "twenty-one billion, one hundred thirty-two million, one hundred twenty-three thousand, forty-four".