21432204139 has 2 divisors, whose sum is σ = 21432204140. Its totient is φ = 21432204138.

The previous prime is 21432204091. The next prime is 21432204169. The reversal of 21432204139 is 93140223412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21432204139 - 2⁹ = 21432203627 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21432204139.

It is not a weakly prime, because it can be changed into another prime (21432204169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716102069 + 10716102070.

It is an arithmetic number, because the mean of its divisors is an integer number (10716102070).

Almost surely, 2^21432204139 is an apocalyptic number.

21432204139 is a deficient number, since it is larger than the sum of its proper divisors (1).

21432204139 is an equidigital number, since it uses as much as digits as its factorization.

21432204139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

The spelling of 21432204139 in words is "twenty-one billion, four hundred thirty-two million, two hundred four thousand, one hundred thirty-nine".