21444505051 has 2 divisors, whose sum is σ = 21444505052. Its totient is φ = 21444505050.

The previous prime is 21444505031. The next prime is 21444505123. The reversal of 21444505051 is 15050544412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21444505051 - 2⁹ = 21444504539 is a prime.

It is not a weakly prime, because it can be changed into another prime (21444505001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10722252525 + 10722252526.

It is an arithmetic number, because the mean of its divisors is an integer number (10722252526).

Almost surely, 2^21444505051 is an apocalyptic number.

21444505051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21444505051 is an equidigital number, since it uses as much as digits as its factorization.

21444505051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16000, while the sum is 31.

The spelling of 21444505051 in words is "twenty-one billion, four hundred forty-four million, five hundred five thousand, fifty-one".