157245421 has 4 divisors (see below), whose sum is σ = 157813372. Its totient is φ = 156677472.

The previous prime is 157245419. The next prime is 157245469. The reversal of 157245421 is 124542751.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67469796 + 89775625 = 8214^2 + 9475^2 .

It is a cyclic number.

It is not a de Polignac number, because 157245421 - 2¹ = 157245419 is a prime.

It is a super-2 number, since 2×157245421² = 49452244850934482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157245401) 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, 283560 + ... + 284113.

It is an arithmetic number, because the mean of its divisors is an integer number (39453343).

Almost surely, 2^157245421 is an apocalyptic number.

It is an amenable number.

157245421 is a deficient number, since it is larger than the sum of its proper divisors (567951).

157245421 is an equidigital number, since it uses as much as digits as its factorization.

157245421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567950.

The product of its digits is 11200, while the sum is 31.

The square root of 157245421 is about 12539.7536259689. The cubic root of 157245421 is about 539.7500226154.

The spelling of 157245421 in words is "one hundred fifty-seven million, two hundred forty-five thousand, four hundred twenty-one".