157123221 has 8 divisors (see below), whose sum is σ = 216255744. Its totient is φ = 101369760.

The previous prime is 157123207. The next prime is 157123243. The reversal of 157123221 is 122321751.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 157123221 - 2¹⁰ = 157122197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 157123191 and 157123200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157123261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 844656 + ... + 844841.

It is an arithmetic number, because the mean of its divisors is an integer number (27031968).

Almost surely, 2^157123221 is an apocalyptic number.

It is an amenable number.

157123221 is a deficient number, since it is larger than the sum of its proper divisors (59132523).

157123221 is a wasteful number, since it uses less digits than its factorization.

157123221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689531.

The product of its digits is 840, while the sum is 24.

The square root of 157123221 is about 12534.8801749359. The cubic root of 157123221 is about 539.6101678891.

Adding to 157123221 its reverse (122321751), we get a palindrome (279444972).

The spelling of 157123221 in words is "one hundred fifty-seven million, one hundred twenty-three thousand, two hundred twenty-one".