42157500621 has 4 divisors (see below), whose sum is σ = 56210000832. Its totient is φ = 28105000412.

The previous prime is 42157500529. The next prime is 42157500629. The reversal of 42157500621 is 12600575124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42157500621 - 2¹¹ = 42157498573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42157500629) 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, 7026250101 + ... + 7026250106.

It is an arithmetic number, because the mean of its divisors is an integer number (14052500208).

Almost surely, 2^42157500621 is an apocalyptic number.

It is an amenable number.

42157500621 is a deficient number, since it is larger than the sum of its proper divisors (14052500211).

42157500621 is a wasteful number, since it uses less digits than its factorization.

42157500621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14052500210.

The product of its (nonzero) digits is 16800, while the sum is 33.

The spelling of 42157500621 in words is "forty-two billion, one hundred fifty-seven million, five hundred thousand, six hundred twenty-one".