21431644270 has 32 divisors (see below), whose sum is σ = 38775252096. Its totient is φ = 8528704800.

The previous prime is 21431644243. The next prime is 21431644279. The reversal of 21431644270 is 7244613412.

It is a super-2 number, since 2×21431644270² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431644279) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1618617 + ... + 1631803.

It is an arithmetic number, because the mean of its divisors is an integer number (1211726628).

Almost surely, 2^21431644270 is an apocalyptic number.

21431644270 is a deficient number, since it is larger than the sum of its proper divisors (17343607826).

21431644270 is a wasteful number, since it uses less digits than its factorization.

21431644270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14016.

The product of its (nonzero) digits is 32256, while the sum is 34.

The spelling of 21431644270 in words is "twenty-one billion, four hundred thirty-one million, six hundred forty-four thousand, two hundred seventy".