121525213 has 4 divisors (see below), whose sum is σ = 121846240. Its totient is φ = 121204188.

The previous prime is 121525211. The next prime is 121525223. The reversal of 121525213 is 312525121.

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: 312525121 = 14723 ⋅21227.

It is a cyclic number.

It is not a de Polignac number, because 121525213 - 2¹ = 121525211 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 (121525211) 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, 159945 + ... + 160702.

It is an arithmetic number, because the mean of its divisors is an integer number (30461560).

Almost surely, 2^121525213 is an apocalyptic number.

It is an amenable number.

121525213 is a deficient number, since it is larger than the sum of its proper divisors (321027).

121525213 is an equidigital number, since it uses as much as digits as its factorization.

121525213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321026.

The product of its digits is 600, while the sum is 22.

The square root of 121525213 is about 11023.8474681030. The cubic root of 121525213 is about 495.3233448378.

It can be divided in two parts, 12 and 1525213, that added together give a square (1525225 = 1235²).

The spelling of 121525213 in words is "one hundred twenty-one million, five hundred twenty-five thousand, two hundred thirteen".