121321690 has 64 divisors (see below), whose sum is σ = 265939200. Its totient is φ = 38900736.

The previous prime is 121321679. The next prime is 121321691. The reversal of 121321690 is 96123121.

It is a super-2 number, since 2×121321690² = 29437904928912200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121321691) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 319921 + ... + 320299.

It is an arithmetic number, because the mean of its divisors is an integer number (4155300).

Almost surely, 2^121321690 is an apocalyptic number.

121321690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121321690 is an abundant number, since it is smaller than the sum of its proper divisors (144617510).

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

121321690 is a wasteful number, since it uses less digits than its factorization.

121321690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 121321690 is about 11014.6125669494. The cubic root of 121321690 is about 495.0466779095.

The spelling of 121321690 in words is "one hundred twenty-one million, three hundred twenty-one thousand, six hundred ninety".