21474131943 has 16 divisors (see below), whose sum is σ = 31662982656. Its totient is φ = 12836341440.

The previous prime is 21474131863. The next prime is 21474131951. The reversal of 21474131943 is 34913147412.

It is a happy number.

It is not a de Polignac number, because 21474131943 - 2⁸ = 21474131687 is a prime.

It is a super-2 number, since 2×21474131943² (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 (21474131963) 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, 4454655 + ... + 4459472.

It is an arithmetic number, because the mean of its divisors is an integer number (1978936416).

Almost surely, 2^21474131943 is an apocalyptic number.

21474131943 is a deficient number, since it is larger than the sum of its proper divisors (10188850713).

21474131943 is a wasteful number, since it uses less digits than its factorization.

21474131943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8914214.

The product of its digits is 72576, while the sum is 39.

The spelling of 21474131943 in words is "twenty-one billion, four hundred seventy-four million, one hundred thirty-one thousand, nine hundred forty-three".