21444452615 has 32 divisors (see below), whose sum is σ = 27147073536. Its totient is φ = 16229973760.

The previous prime is 21444452599. The next prime is 21444452629. The reversal of 21444452615 is 51625444412.

It is not a de Polignac number, because 21444452615 - 2⁴ = 21444452599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11208899 + ... + 11210811.

It is an arithmetic number, because the mean of its divisors is an integer number (848346048).

Almost surely, 2^21444452615 is an apocalyptic number.

21444452615 is a deficient number, since it is larger than the sum of its proper divisors (5702620921).

21444452615 is a wasteful number, since it uses less digits than its factorization.

21444452615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2959.

The product of its digits is 153600, while the sum is 38.

The spelling of 21444452615 in words is "twenty-one billion, four hundred forty-four million, four hundred fifty-two thousand, six hundred fifteen".