21432254071 has 2 divisors, whose sum is σ = 21432254072. Its totient is φ = 21432254070.

The previous prime is 21432254021. The next prime is 21432254089. The reversal of 21432254071 is 17045223412.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21432254071 - 2¹⁵ = 21432221303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21432254021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716127035 + 10716127036.

It is an arithmetic number, because the mean of its divisors is an integer number (10716127036).

Almost surely, 2^21432254071 is an apocalyptic number.

21432254071 is a deficient number, since it is larger than the sum of its proper divisors (1).

21432254071 is an equidigital number, since it uses as much as digits as its factorization.

21432254071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 31.

Adding to 21432254071 its reverse (17045223412), we get a palindrome (38477477483).

The spelling of 21432254071 in words is "twenty-one billion, four hundred thirty-two million, two hundred fifty-four thousand, seventy-one".