121522157 has 4 divisors (see below), whose sum is σ = 127918080. Its totient is φ = 115126236.

The previous prime is 121522153. The next prime is 121522169. The reversal of 121522157 is 751225121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 751225121 = 17 ⋅44189713.

It is a cyclic number.

It is not a de Polignac number, because 121522157 - 2² = 121522153 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121522153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3197933 + ... + 3197970.

It is an arithmetic number, because the mean of its divisors is an integer number (31979520).

Almost surely, 2^121522157 is an apocalyptic number.

It is an amenable number.

121522157 is a deficient number, since it is larger than the sum of its proper divisors (6395923).

121522157 is an equidigital number, since it uses as much as digits as its factorization.

121522157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6395922.

The product of its digits is 1400, while the sum is 26.

The square root of 121522157 is about 11023.7088586374. The cubic root of 121522157 is about 495.3191928302.

Adding to 121522157 its reverse (751225121), we get a palindrome (872747278).

The spelling of 121522157 in words is "one hundred twenty-one million, five hundred twenty-two thousand, one hundred fifty-seven".