421543518151557 has 8 divisors (see below), whose sum is σ = 563132704938784. Its totient is φ = 280491671732688.

The previous prime is 421543518151537. The next prime is 421543518151571. The reversal of 421543518151557 is 755151815345124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 421543518151557 - 2⁶ = 421543518151493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421543518151497 and 421543518151506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421543518151507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134335090258 + ... + 134335093395.

It is an arithmetic number, because the mean of its divisors is an integer number (70391588117348).

Almost surely, 2^{421543518151557} is an apocalyptic number.

It is an amenable number.

421543518151557 is a deficient number, since it is larger than the sum of its proper divisors (141589186787227).

421543518151557 is a wasteful number, since it uses less digits than its factorization.

421543518151557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268670184179.

The product of its digits is 16800000, while the sum is 57.

The spelling of 421543518151557 in words is "four hundred twenty-one trillion, five hundred forty-three billion, five hundred eighteen million, one hundred fifty-one thousand, five hundred fifty-seven".