21131403044 has 6 divisors (see below), whose sum is σ = 36979955334. Its totient is φ = 10565701520.

The previous prime is 21131402989. The next prime is 21131403067. The reversal of 21131403044 is 44030413112.

It can be written as a sum of positive squares in only one way, i.e., 20082290944 + 1049112100 = 141712^2 + 32390^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2641425377 + ... + 2641425384.

It is an arithmetic number, because the mean of its divisors is an integer number (6163325889).

Almost surely, 2^21131403044 is an apocalyptic number.

It is an amenable number.

21131403044 is a deficient number, since it is larger than the sum of its proper divisors (15848552290).

21131403044 is a wasteful number, since it uses less digits than its factorization.

21131403044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5282850765 (or 5282850763 counting only the distinct ones).

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

Adding to 21131403044 its reverse (44030413112), we get a palindrome (65161816156).

The spelling of 21131403044 in words is "twenty-one billion, one hundred thirty-one million, four hundred three thousand, forty-four".