21544246143256 has 16 divisors (see below), whose sum is σ = 40472699502600. Its totient is φ = 10751526275904.

The previous prime is 21544246143241. The next prime is 21544246143257. The reversal of 21544246143256 is 65234164244512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21544246143257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2574595021 + ... + 2574603388.

Almost surely, 2^{21544246143256} is an apocalyptic number.

It is an amenable number.

21544246143256 is a deficient number, since it is larger than the sum of its proper divisors (18928453359344).

21544246143256 is a wasteful number, since it uses less digits than its factorization.

21544246143256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5149198938 (or 5149198934 counting only the distinct ones).

The product of its digits is 5529600, while the sum is 49.

The spelling of 21544246143256 in words is "twenty-one trillion, five hundred forty-four billion, two hundred forty-six million, one hundred forty-three thousand, two hundred fifty-six".