21432233971 has 2 divisors, whose sum is σ = 21432233972. Its totient is φ = 21432233970.

The previous prime is 21432233951. The next prime is 21432234113. The reversal of 21432233971 is 17933223412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21432233971 - 2⁷ = 21432233843 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21432233971.

It is not a weakly prime, because it can be changed into another prime (21432233951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716116985 + 10716116986.

It is an arithmetic number, because the mean of its divisors is an integer number (10716116986).

Almost surely, 2^21432233971 is an apocalyptic number.

21432233971 is a deficient number, since it is larger than the sum of its proper divisors (1).

21432233971 is an equidigital number, since it uses as much as digits as its factorization.

21432233971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 37.

The spelling of 21432233971 in words is "twenty-one billion, four hundred thirty-two million, two hundred thirty-three thousand, nine hundred seventy-one".