121172930 has 16 divisors (see below), whose sum is σ = 218964600. Its totient is φ = 48279552.

The previous prime is 121172929. The next prime is 121172939. The reversal of 121172930 is 39271121.

It can be written as a sum of positive squares in 4 ways, for example, as 92987449 + 28185481 = 9643^2 + 5309^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 121172930.

It is not an unprimeable number, because it can be changed into a prime (121172939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21005 + ... + 26144.

Almost surely, 2^121172930 is an apocalyptic number.

121172930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121172930 is a deficient number, since it is larger than the sum of its proper divisors (97791670).

121172930 is a wasteful number, since it uses less digits than its factorization.

121172930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47413.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 121172930 is about 11007.8576480621. The cubic root of 121172930 is about 494.8442594088.

The spelling of 121172930 in words is "one hundred twenty-one million, one hundred seventy-two thousand, nine hundred thirty".