157212220 has 24 divisors (see below), whose sum is σ = 360159408. Its totient is φ = 57168000.

The previous prime is 157212169. The next prime is 157212221. The reversal of 157212220 is 22212751.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 157212191 and 157212200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157212221) 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 7 ways as a sum of consecutive naturals, for example, 357081 + ... + 357520.

It is an arithmetic number, because the mean of its divisors is an integer number (15006642).

Almost surely, 2^157212220 is an apocalyptic number.

157212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

157212220 is an abundant number, since it is smaller than the sum of its proper divisors (202947188).

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

157212220 is a wasteful number, since it uses less digits than its factorization.

157212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714621 (or 714619 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 157212220 is about 12538.4297262456. The cubic root of 157212220 is about 539.7120321040.

Adding to 157212220 its reverse (22212751), we get a palindrome (179424971).

The spelling of 157212220 in words is "one hundred fifty-seven million, two hundred twelve thousand, two hundred twenty".