21442333723 has 2 divisors, whose sum is σ = 21442333724. Its totient is φ = 21442333722.

The previous prime is 21442333681. The next prime is 21442333729. The reversal of 21442333723 is 32733324412.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21442333723 - 2²⁵ = 21408779291 is a prime.

It is not a weakly prime, because it can be changed into another prime (21442333729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721166861 + 10721166862.

It is an arithmetic number, because the mean of its divisors is an integer number (10721166862).

Almost surely, 2^21442333723 is an apocalyptic number.

21442333723 is a deficient number, since it is larger than the sum of its proper divisors (1).

21442333723 is an equidigital number, since it uses as much as digits as its factorization.

21442333723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 34.

The spelling of 21442333723 in words is "twenty-one billion, four hundred forty-two million, three hundred thirty-three thousand, seven hundred twenty-three".