157522221 has 24 divisors (see below), whose sum is σ = 241558200. Its totient is φ = 98574336.

The previous prime is 157522219. The next prime is 157522241. The reversal of 157522221 is 122225751.

157522221 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 4 ways, for example, as 34644996 + 122877225 = 5886^2 + 11085^2 .

It is not a de Polignac number, because 157522221 - 2¹ = 157522219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157522241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67551 + ... + 69843.

It is an arithmetic number, because the mean of its divisors is an integer number (10064925).

Almost surely, 2^157522221 is an apocalyptic number.

It is an amenable number.

157522221 is a deficient number, since it is larger than the sum of its proper divisors (84035979).

157522221 is a wasteful number, since it uses less digits than its factorization.

157522221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2765 (or 2762 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 157522221 is about 12550.7856726183. The cubic root of 157522221 is about 540.0665452971.

Adding to 157522221 its reverse (122225751), we get a palindrome (279747972).

The spelling of 157522221 in words is "one hundred fifty-seven million, five hundred twenty-two thousand, two hundred twenty-one".