157021220 has 12 divisors (see below), whose sum is σ = 329744604. Its totient is φ = 62808480.

The previous prime is 157021217. The next prime is 157021247. The reversal of 157021220 is 22120751.

157021220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 93276964 + 63744256 = 9658^2 + 7984^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 7851061 = 157021220 / (1 + 5 + 7 + 0 + 2 + 1 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 157021192 and 157021201.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3925511 + ... + 3925550.

It is an arithmetic number, because the mean of its divisors is an integer number (27478717).

Almost surely, 2^157021220 is an apocalyptic number.

157021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

157021220 is an abundant number, since it is smaller than the sum of its proper divisors (172723384).

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

157021220 is a wasteful number, since it uses less digits than its factorization.

157021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7851070 (or 7851068 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 157021220 is about 12530.8108277158. The cubic root of 157021220 is about 539.4933748585.

Adding to 157021220 its reverse (22120751), we get a palindrome (179141971).

The spelling of 157021220 in words is "one hundred fifty-seven million, twenty-one thousand, two hundred twenty".