21444502395 has 16 divisors (see below), whose sum is σ = 34794461952. Its totient is φ = 11275981920.

The previous prime is 21444502393. The next prime is 21444502397. The reversal of 21444502395 is 59320544412.

It is an interprime number because it is at equal distance from previous prime (21444502393) and next prime (21444502397).

It is not a de Polignac number, because 21444502395 - 2¹ = 21444502393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21444502393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10066777 + ... + 10068906.

It is an arithmetic number, because the mean of its divisors is an integer number (2174653872).

Almost surely, 2^21444502395 is an apocalyptic number.

21444502395 is a deficient number, since it is larger than the sum of its proper divisors (13349959557).

21444502395 is a wasteful number, since it uses less digits than its factorization.

21444502395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20135762.

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 21444502395 in words is "twenty-one billion, four hundred forty-four million, five hundred two thousand, three hundred ninety-five".