121655213 has 16 divisors (see below), whose sum is σ = 132745536. Its totient is φ = 111041280.

The previous prime is 121655189. The next prime is 121655231. The reversal of 121655213 is 312556121.

It is not a de Polignac number, because 121655213 - 2²⁰ = 120606637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121655263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118643 + ... + 119663.

It is an arithmetic number, because the mean of its divisors is an integer number (8296596).

Almost surely, 2^121655213 is an apocalyptic number.

It is an amenable number.

121655213 is a deficient number, since it is larger than the sum of its proper divisors (11090323).

121655213 is a wasteful number, since it uses less digits than its factorization.

121655213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244.

The product of its digits is 1800, while the sum is 26.

The square root of 121655213 is about 11029.7422000698. The cubic root of 121655213 is about 495.4999037757.

The spelling of 121655213 in words is "one hundred twenty-one million, six hundred fifty-five thousand, two hundred thirteen".