157065021 has 16 divisors (see below), whose sum is σ = 236635200. Its totient is φ = 102934224.

The previous prime is 157065017. The next prime is 157065031. The reversal of 157065021 is 120560751.

157065021 is a `hidden beast` number, since 1 + 5 + 7 + 0 + 650 + 2 + 1 = 666.

It is not a de Polignac number, because 157065021 - 2² = 157065017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157065031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47706 + ... + 50891.

It is an arithmetic number, because the mean of its divisors is an integer number (14789700).

Almost surely, 2^157065021 is an apocalyptic number.

It is an amenable number.

157065021 is a deficient number, since it is larger than the sum of its proper divisors (79570179).

157065021 is an equidigital number, since it uses as much as digits as its factorization.

157065021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98665 (or 98659 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 157065021 is about 12532.5584379248. The cubic root of 157065021 is about 539.5435340077.

The spelling of 157065021 in words is "one hundred fifty-seven million, sixty-five thousand, twenty-one".