21445457288272 has 10 divisors (see below), whose sum is σ = 41550573496058. Its totient is φ = 10722728644128.

The previous prime is 21445457288209. The next prime is 21445457288287. The reversal of 21445457288272 is 27288275454412.

It can be written as a sum of positive squares in only one way, i.e., 14907290112016 + 6538167176256 = 3860996^2 + 2556984^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21445457288272.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670170540243 + ... + 670170540274.

Almost surely, 2^{21445457288272} is an apocalyptic number.

It is an amenable number.

21445457288272 is a deficient number, since it is larger than the sum of its proper divisors (20105116207786).

21445457288272 is a wasteful number, since it uses less digits than its factorization.

21445457288272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340341080525 (or 1340341080519 counting only the distinct ones).

The product of its digits is 80281600, while the sum is 61.

The spelling of 21445457288272 in words is "twenty-one trillion, four hundred forty-five billion, four hundred fifty-seven million, two hundred eighty-eight thousand, two hundred seventy-two".