121173690 has 64 divisors (see below), whose sum is σ = 319790592. Its totient is φ = 29140800.

The previous prime is 121173677. The next prime is 121173707. The reversal of 121173690 is 96371121.

It is a super-2 number, since 2×121173690² = 29366126296432200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41829 + ... + 44631.

It is an arithmetic number, because the mean of its divisors is an integer number (4996728).

Almost surely, 2^121173690 is an apocalyptic number.

121173690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121173690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159895296).

121173690 is an abundant number, since it is smaller than the sum of its proper divisors (198616902).

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

121173690 is a wasteful number, since it uses less digits than its factorization.

121173690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2955.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 121173690 is about 11007.8921688033. The cubic root of 121173690 is about 494.8452939656.

The spelling of 121173690 in words is "one hundred twenty-one million, one hundred seventy-three thousand, six hundred ninety".