121770816 has 28 divisors (see below), whose sum is σ = 322185792. Its totient is φ = 40590208.

The previous prime is 121770799. The next prime is 121770833. The reversal of 121770816 is 618077121.

It is an interprime number because it is at equal distance from previous prime (121770799) and next prime (121770833).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316920 + ... + 317303.

Almost surely, 2^121770816 is an apocalyptic number.

121770816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121770816 is an abundant number, since it is smaller than the sum of its proper divisors (200414976).

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

121770816 is an equidigital number, since it uses as much as digits as its factorization.

121770816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634238 (or 634228 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 33.

The square root of 121770816 is about 11034.9814680406. The cubic root of 121770816 is about 495.6568038643.

The spelling of 121770816 in words is "one hundred twenty-one million, seven hundred seventy thousand, eight hundred sixteen".