121996778 has 16 divisors (see below), whose sum is σ = 189617760. Its totient is φ = 58830096.

The previous prime is 121996759. The next prime is 121996813. The reversal of 121996778 is 877699121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3500 + ... + 16007.

It is an arithmetic number, because the mean of its divisors is an integer number (11851110).

Almost surely, 2^121996778 is an apocalyptic number.

121996778 is a deficient number, since it is larger than the sum of its proper divisors (67620982).

121996778 is a wasteful number, since it uses less digits than its factorization.

121996778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19621.

The product of its digits is 381024, while the sum is 50.

The square root of 121996778 is about 11045.2151631374. The cubic root of 121996778 is about 495.9632002051.

The spelling of 121996778 in words is "one hundred twenty-one million, nine hundred ninety-six thousand, seven hundred seventy-eight".