121663215 has 80 divisors (see below), whose sum is σ = 234387648. Its totient is φ = 60217344.

The previous prime is 121663183. The next prime is 121663229. The reversal of 121663215 is 512366121.

121663215 is a `hidden beast` number, since 1 + 2 + 16 + 632 + 15 = 666.

It is not a de Polignac number, because 121663215 - 2⁵ = 121663183 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 344479 + ... + 344831.

Almost surely, 2^121663215 is an apocalyptic number.

121663215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121663215 is a deficient number, since it is larger than the sum of its proper divisors (112724433).

121663215 is a wasteful number, since it uses less digits than its factorization.

121663215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430 (or 421 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 121663215 is about 11030.1049405706. The cubic root of 121663215 is about 495.5107675472.

The spelling of 121663215 in words is "one hundred twenty-one million, six hundred sixty-three thousand, two hundred fifteen".