121992855 has 16 divisors (see below), whose sum is σ = 197864160. Its totient is φ = 64171008.

The previous prime is 121992847. The next prime is 121992877. The reversal of 121992855 is 558299121.

It is not a de Polignac number, because 121992855 - 2³ = 121992847 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54610 + ... + 56799.

It is an arithmetic number, because the mean of its divisors is an integer number (12366510).

Almost surely, 2^121992855 is an apocalyptic number.

121992855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121992855 is a deficient number, since it is larger than the sum of its proper divisors (75871305).

121992855 is a wasteful number, since it uses less digits than its factorization.

121992855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111490.

The product of its digits is 64800, while the sum is 42.

The square root of 121992855 is about 11045.0375734988. The cubic root of 121992855 is about 495.9578839868.

The spelling of 121992855 in words is "one hundred twenty-one million, nine hundred ninety-two thousand, eight hundred fifty-five".