421611157 has 4 divisors (see below), whose sum is σ = 459939456. Its totient is φ = 383282860.

The previous prime is 421611139. The next prime is 421611161. The reversal of 421611157 is 751116124.

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 a de Polignac number, because none of the positive numbers 2^k-421611157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421614157) 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, 19164133 + ... + 19164154.

It is an arithmetic number, because the mean of its divisors is an integer number (114984864).

Almost surely, 2^421611157 is an apocalyptic number.

It is an amenable number.

421611157 is a deficient number, since it is larger than the sum of its proper divisors (38328299).

421611157 is a wasteful number, since it uses less digits than its factorization.

421611157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38328298.

The product of its digits is 1680, while the sum is 28.

The square root of 421611157 is about 20533.1721124623. The cubic root of 421611157 is about 749.8436159869.

The spelling of 421611157 in words is "four hundred twenty-one million, six hundred eleven thousand, one hundred fifty-seven".