21044131400 has 24 divisors (see below), whose sum is σ = 48927605970. Its totient is φ = 8417652480.

The previous prime is 21044131393. The next prime is 21044131403. The reversal of 21044131400 is 413144012.

It can be written as a sum of positive squares in 3 ways, for example, as 15671534596 + 5372596804 = 125186^2 + 73298^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (21044131403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52610129 + ... + 52610528.

Almost surely, 2^21044131400 is an apocalyptic number.

21044131400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21044131400 is an abundant number, since it is smaller than the sum of its proper divisors (27883474570).

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

21044131400 is a wasteful number, since it uses less digits than its factorization.

21044131400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105220673 (or 105220664 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21044131400 its reverse (413144012), we get a palindrome (21457275412).

The spelling of 21044131400 in words is "twenty-one billion, forty-four million, one hundred thirty-one thousand, four hundred".