157274021 has 4 divisors (see below), whose sum is σ = 166525452. Its totient is φ = 148022592.

The previous prime is 157274011. The next prime is 157274027. The reversal of 157274021 is 120472751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120472751 = 7 ⋅17210393.

It can be written as a sum of positive squares in 2 ways, for example, as 43744996 + 113529025 = 6614^2 + 10655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157274021 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 (157274027) 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, 4625690 + ... + 4625723.

It is an arithmetic number, because the mean of its divisors is an integer number (41631363).

Almost surely, 2^157274021 is an apocalyptic number.

It is an amenable number.

157274021 is a deficient number, since it is larger than the sum of its proper divisors (9251431).

157274021 is an equidigital number, since it uses as much as digits as its factorization.

157274021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9251430.

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 157274021 is about 12540.8939474026. The cubic root of 157274021 is about 539.7827441084.

The spelling of 157274021 in words is "one hundred fifty-seven million, two hundred seventy-four thousand, twenty-one".