21447313725 has 12 divisors (see below), whose sum is σ = 35459558816. Its totient is φ = 11438567280.

The previous prime is 21447313721. The next prime is 21447313751. The reversal of 21447313725 is 52731374412.

It is not a de Polignac number, because 21447313725 - 2² = 21447313721 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21447313721) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 142982017 + ... + 142982166.

Almost surely, 2^21447313725 is an apocalyptic number.

21447313725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21447313725 is a deficient number, since it is larger than the sum of its proper divisors (14012245091).

21447313725 is a wasteful number, since it uses less digits than its factorization.

21447313725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285964196 (or 285964191 counting only the distinct ones).

The product of its digits is 141120, while the sum is 39.

The spelling of 21447313725 in words is "twenty-one billion, four hundred forty-seven million, three hundred thirteen thousand, seven hundred twenty-five".