121753978 has 4 divisors (see below), whose sum is σ = 182630970. Its totient is φ = 60876988.

The previous prime is 121753967. The next prime is 121754021. The reversal of 121753978 is 879357121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 110817729 + 10936249 = 10527^2 + 3307^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30438493 + ... + 30438496.

Almost surely, 2^121753978 is an apocalyptic number.

121753978 is a deficient number, since it is larger than the sum of its proper divisors (60876992).

121753978 is an equidigital number, since it uses as much as digits as its factorization.

121753978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60876991.

The product of its digits is 105840, while the sum is 43.

The square root of 121753978 is about 11034.2185042712. The cubic root of 121753978 is about 495.6339569725.

The spelling of 121753978 in words is "one hundred twenty-one million, seven hundred fifty-three thousand, nine hundred seventy-eight".