157021242 has 32 divisors (see below), whose sum is σ = 359462400. Its totient is φ = 44793648.

The previous prime is 157021217. The next prime is 157021247. The reversal of 157021242 is 242120751.

It is not an unprimeable number, because it can be changed into a prime (157021247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28509 + ... + 33567.

It is an arithmetic number, because the mean of its divisors is an integer number (11233200).

Almost surely, 2^157021242 is an apocalyptic number.

157021242 is an abundant number, since it is smaller than the sum of its proper divisors (202441158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

157021242 is a wasteful number, since it uses less digits than its factorization.

157021242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5810.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 157021242 is about 12530.8117055520. The cubic root of 157021242 is about 539.4934000543.

Adding to 157021242 its reverse (242120751), we get a palindrome (399141993).

The spelling of 157021242 in words is "one hundred fifty-seven million, twenty-one thousand, two hundred forty-two".