21893426431 has 4 divisors (see below), whose sum is σ = 22648372200. Its totient is φ = 21138480664.

The previous prime is 21893426411. The next prime is 21893426437. The reversal of 21893426431 is 13462439812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21893426431 - 2⁹ = 21893425919 is a prime.

It is a super-2 number, since 2×21893426431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21893426437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377472841 + ... + 377472898.

It is an arithmetic number, because the mean of its divisors is an integer number (5662093050).

Almost surely, 2^21893426431 is an apocalyptic number.

21893426431 is a deficient number, since it is larger than the sum of its proper divisors (754945769).

21893426431 is an equidigital number, since it uses as much as digits as its factorization.

21893426431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754945768.

The product of its digits is 248832, while the sum is 43.

The spelling of 21893426431 in words is "twenty-one billion, eight hundred ninety-three million, four hundred twenty-six thousand, four hundred thirty-one".