121981870 has 16 divisors (see below), whose sum is σ = 221700960. Its totient is φ = 48318624.

The previous prime is 121981861. The next prime is 121981897. The reversal of 121981870 is 78189121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58185 + ... + 60244.

It is an arithmetic number, because the mean of its divisors is an integer number (13856310).

Almost surely, 2^121981870 is an apocalyptic number.

121981870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121981870 is a deficient number, since it is larger than the sum of its proper divisors (99719090).

121981870 is a wasteful number, since it uses less digits than its factorization.

121981870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118539.

The product of its (nonzero) digits is 8064, while the sum is 37.

The square root of 121981870 is about 11044.5402801565. The cubic root of 121981870 is about 495.9429971563.

The spelling of 121981870 in words is "one hundred twenty-one million, nine hundred eighty-one thousand, eight hundred seventy".