21432301431 has 4 divisors (see below), whose sum is σ = 28576401912. Its totient is φ = 14288200952.

The previous prime is 21432301381. The next prime is 21432301447. The reversal of 21432301431 is 13410323412.

It is a happy number.

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 21432301431 - 2⁶ = 21432301367 is a prime.

It is a super-2 number, since 2×21432301431² (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 (21432301831) 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, 3572050236 + ... + 3572050241.

It is an arithmetic number, because the mean of its divisors is an integer number (7144100478).

Almost surely, 2^21432301431 is an apocalyptic number.

21432301431 is a deficient number, since it is larger than the sum of its proper divisors (7144100481).

21432301431 is an equidigital number, since it uses as much as digits as its factorization.

21432301431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7144100480.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21432301431 its reverse (13410323412), we get a palindrome (34842624843).

The spelling of 21432301431 in words is "twenty-one billion, four hundred thirty-two million, three hundred one thousand, four hundred thirty-one".