421542374557 has 2 divisors, whose sum is σ = 421542374558. Its totient is φ = 421542374556.

The previous prime is 421542374551. The next prime is 421542374593. The reversal of 421542374557 is 755473245124.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 296290794276 + 125251580281 = 544326^2 + 353909^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421542374557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 421542374557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421542374551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210771187278 + 210771187279.

It is an arithmetic number, because the mean of its divisors is an integer number (210771187279).

Almost surely, 2^421542374557 is an apocalyptic number.

It is an amenable number.

421542374557 is a deficient number, since it is larger than the sum of its proper divisors (1).

421542374557 is an equidigital number, since it uses as much as digits as its factorization.

421542374557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4704000, while the sum is 49.

The spelling of 421542374557 in words is "four hundred twenty-one billion, five hundred forty-two million, three hundred seventy-four thousand, five hundred fifty-seven".