21050744157243 has 16 divisors (see below), whose sum is σ = 31946928804000. Its totient is φ = 13691540914560.

The previous prime is 21050744157181. The next prime is 21050744157271. The reversal of 21050744157243 is 34275144705012.

21050744157243 is a `hidden beast` number, since 2 + 1 + 0 + 5 + 0 + 74 + 4 + 1 + 572 + 4 + 3 = 666.

It is not a de Polignac number, because 21050744157243 - 2²² = 21050739962939 is a prime.

It is a super-2 number, since 2×21050744157243² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21050744150243) 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, 9508013418 + ... + 9508015631.

It is an arithmetic number, because the mean of its divisors is an integer number (1996683050250).

Almost surely, 2^{21050744157243} is an apocalyptic number.

21050744157243 is a deficient number, since it is larger than the sum of its proper divisors (10896184646757).

21050744157243 is a wasteful number, since it uses less digits than its factorization.

21050744157243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19016029099 (or 19016029093 counting only the distinct ones).

The product of its (nonzero) digits is 940800, while the sum is 45.

The spelling of 21050744157243 in words is "twenty-one trillion, fifty billion, seven hundred forty-four million, one hundred fifty-seven thousand, two hundred forty-three".