121298978 has 16 divisors (see below), whose sum is σ = 194064984. Its totient is φ = 56663040.

The previous prime is 121298971. The next prime is 121298981. The reversal of 121298978 is 879892121.

It can be written as a sum of positive squares in 4 ways, for example, as 120846049 + 452929 = 10993^2 + 673^2 .

It is not an unprimeable number, because it can be changed into a prime (121298971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8363 + ... + 17678.

Almost surely, 2^121298978 is an apocalyptic number.

121298978 is a deficient number, since it is larger than the sum of its proper divisors (72766006).

121298978 is a wasteful number, since it uses less digits than its factorization.

121298978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26197.

The product of its digits is 145152, while the sum is 47.

The square root of 121298978 is about 11013.5815246449. The cubic root of 121298978 is about 495.0157842805.

It can be divided in two parts, 12 and 1298978, that multiplied together give a triangular number (15587736 = T₅₅₈₃).

The spelling of 121298978 in words is "one hundred twenty-one million, two hundred ninety-eight thousand, nine hundred seventy-eight".