157227621 has 4 divisors (see below), whose sum is σ = 209636832. Its totient is φ = 104818412.

The previous prime is 157227613. The next prime is 157227671. The reversal of 157227621 is 126722751.

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, and also an emirpimes, since its reverse is a distinct semiprime: 126722751 = 3 ⋅42240917.

It is a cyclic number.

It is not a de Polignac number, because 157227621 - 2³ = 157227613 is a prime.

It is a super-4 number, since 4×157227621⁴ (a number of 34 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157227601) 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, 26204601 + ... + 26204606.

It is an arithmetic number, because the mean of its divisors is an integer number (52409208).

Almost surely, 2^157227621 is an apocalyptic number.

It is an amenable number.

157227621 is a deficient number, since it is larger than the sum of its proper divisors (52409211).

157227621 is an equidigital number, since it uses as much as digits as its factorization.

157227621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52409210.

The product of its digits is 11760, while the sum is 33.

The square root of 157227621 is about 12539.0438630703. The cubic root of 157227621 is about 539.7296554872.

The spelling of 157227621 in words is "one hundred fifty-seven million, two hundred twenty-seven thousand, six hundred twenty-one".