121172051 has 24 divisors (see below), whose sum is σ = 165607344. Its totient is φ = 87151680.

The previous prime is 121172041. The next prime is 121172071. The reversal of 121172051 is 150271121.

It is a happy number.

It is not a de Polignac number, because 121172051 - 2¹⁰ = 121171027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121172041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1640 + ... + 15653.

It is an arithmetic number, because the mean of its divisors is an integer number (6900306).

Almost surely, 2^121172051 is an apocalyptic number.

121172051 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121172051 is a deficient number, since it is larger than the sum of its proper divisors (44435293).

121172051 is a wasteful number, since it uses less digits than its factorization.

121172051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17331 (or 17324 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 20.

The square root of 121172051 is about 11007.8177219647. The cubic root of 121172051 is about 494.8430628567.

The spelling of 121172051 in words is "one hundred twenty-one million, one hundred seventy-two thousand, fifty-one".