147157421 has 4 divisors (see below), whose sum is σ = 148532832. Its totient is φ = 145782012.

The previous prime is 147157391. The next prime is 147157447. The reversal of 147157421 is 124751741.

147157421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-147157421 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 (147157121) 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, 687545 + ... + 687758.

It is an arithmetic number, because the mean of its divisors is an integer number (37133208).

Almost surely, 2^147157421 is an apocalyptic number.

It is an amenable number.

147157421 is a deficient number, since it is larger than the sum of its proper divisors (1375411).

147157421 is a wasteful number, since it uses less digits than its factorization.

147157421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375410.

The product of its digits is 7840, while the sum is 32.

The square root of 147157421 is about 12130.8458484971. The cubic root of 147157421 is about 527.9515338988.

The spelling of 147157421 in words is "one hundred forty-seven million, one hundred fifty-seven thousand, four hundred twenty-one".