21432301493 has 2 divisors, whose sum is σ = 21432301494. Its totient is φ = 21432301492.

The previous prime is 21432301469. The next prime is 21432301519. The reversal of 21432301493 is 39410323412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18479139844 + 2953161649 = 135938^2 + 54343^2 .

It is a cyclic number.

It is not a de Polignac number, because 21432301493 - 2²² = 21428107189 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21432301193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716150746 + 10716150747.

It is an arithmetic number, because the mean of its divisors is an integer number (10716150747).

Almost surely, 2^21432301493 is an apocalyptic number.

It is an amenable number.

21432301493 is a deficient number, since it is larger than the sum of its proper divisors (1).

21432301493 is an equidigital number, since it uses as much as digits as its factorization.

21432301493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 32.

The spelling of 21432301493 in words is "twenty-one billion, four hundred thirty-two million, three hundred one thousand, four hundred ninety-three".