2157641839247 has 16 divisors (see below), whose sum is σ = 2318805918720. Its totient is φ = 2000286465408.

The previous prime is 2157641839169. The next prime is 2157641839261. The reversal of 2157641839247 is 7429381467512.

It is a cyclic number.

It is not a de Polignac number, because 2157641839247 - 2¹⁴ = 2157641822863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157641839277) 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, 21430178 + ... + 21530624.

It is an arithmetic number, because the mean of its divisors is an integer number (144925369920).

Almost surely, 2^{2157641839247} is an apocalyptic number.

2157641839247 is a deficient number, since it is larger than the sum of its proper divisors (161164079473).

2157641839247 is a wasteful number, since it uses less digits than its factorization.

2157641839247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119390.

The product of its digits is 20321280, while the sum is 59.

The spelling of 2157641839247 in words is "two trillion, one hundred fifty-seven billion, six hundred forty-one million, eight hundred thirty-nine thousand, two hundred forty-seven".