121939210 has 16 divisors (see below), whose sum is σ = 219755592. Its totient is φ = 48716800.

The previous prime is 121939199. The next prime is 121939217. The reversal of 121939210 is 12939121.

It can be written as a sum of positive squares in 4 ways, for example, as 67223601 + 54715609 = 8199^2 + 7397^2 .

It is not an unprimeable number, because it can be changed into a prime (121939217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1890 + ... + 15730.

Almost surely, 2^121939210 is an apocalyptic number.

121939210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121939210 is a deficient number, since it is larger than the sum of its proper divisors (97816382).

121939210 is a wasteful number, since it uses less digits than its factorization.

121939210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14729.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 121939210 is about 11042.6088403058. The cubic root of 121939210 is about 495.8851760087.

The spelling of 121939210 in words is "one hundred twenty-one million, nine hundred thirty-nine thousand, two hundred ten".