121155636 has 36 divisors (see below), whose sum is σ = 328852608. Its totient is φ = 34615728.

The previous prime is 121155623. The next prime is 121155637. The reversal of 121155636 is 636551121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121155637) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102436 + ... + 103611.

Almost surely, 2^121155636 is an apocalyptic number.

It is an amenable number.

121155636 is an abundant number, since it is smaller than the sum of its proper divisors (207696972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121155636 is a wasteful number, since it uses less digits than its factorization.

121155636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206068 (or 206059 counting only the distinct ones).

The product of its digits is 5400, while the sum is 30.

The square root of 121155636 is about 11007.0720902518. The cubic root of 121155636 is about 494.8207166263.

The spelling of 121155636 in words is "one hundred twenty-one million, one hundred fifty-five thousand, six hundred thirty-six".