121912778954 has 8 divisors (see below), whose sum is σ = 182873950020. Its totient is φ = 60954795616.

The previous prime is 121912778951. The next prime is 121912778971. The reversal of 121912778954 is 459877219121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 82413203929 + 39499575025 = 287077^2 + 198745^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 121912778954.

It is not an unprimeable number, because it can be changed into a prime (121912778951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 698909 + ... + 855744.

Almost surely, 2^121912778954 is an apocalyptic number.

121912778954 is a deficient number, since it is larger than the sum of its proper divisors (60961171066).

121912778954 is a wasteful number, since it uses less digits than its factorization.

121912778954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1593864.

The product of its digits is 2540160, while the sum is 56.

The spelling of 121912778954 in words is "one hundred twenty-one billion, nine hundred twelve million, seven hundred seventy-eight thousand, nine hundred fifty-four".