21451650323 has 2 divisors, whose sum is σ = 21451650324. Its totient is φ = 21451650322.

The previous prime is 21451650299. The next prime is 21451650347. The reversal of 21451650323 is 32305615412.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (21451650299) and next prime (21451650347).

It is a cyclic number.

It is not a de Polignac number, because 21451650323 - 2²⁰ = 21450601747 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21451650323.

It is not a weakly prime, because it can be changed into another prime (21451650383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10725825161 + 10725825162.

It is an arithmetic number, because the mean of its divisors is an integer number (10725825162).

Almost surely, 2^21451650323 is an apocalyptic number.

21451650323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21451650323 is an equidigital number, since it uses as much as digits as its factorization.

21451650323 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 32.

The spelling of 21451650323 in words is "twenty-one billion, four hundred fifty-one million, six hundred fifty thousand, three hundred twenty-three".