121561370 has 32 divisors (see below), whose sum is σ = 252661248. Its totient is φ = 41246208.

The previous prime is 121561367. The next prime is 121561393. The reversal of 121561370 is 73165121.

It is a Curzon 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, 2162 + ... + 15741.

It is an arithmetic number, because the mean of its divisors is an integer number (7895664).

Almost surely, 2^121561370 is an apocalyptic number.

121561370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121561370 is an abundant number, since it is smaller than the sum of its proper divisors (131099878).

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

121561370 is a wasteful number, since it uses less digits than its factorization.

121561370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18014.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 121561370 is about 11025.4872908185. The cubic root of 121561370 is about 495.3724639461.

The spelling of 121561370 in words is "one hundred twenty-one million, five hundred sixty-one thousand, three hundred seventy".