121557562612 has 6 divisors (see below), whose sum is σ = 212725734578. Its totient is φ = 60778781304.

The previous prime is 121557562597. The next prime is 121557562613. The reversal of 121557562612 is 216265755121.

It can be written as a sum of positive squares in only one way, i.e., 67322605156 + 54234957456 = 259466^2 + 232884^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121557562613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15194695323 + ... + 15194695330.

Almost surely, 2^121557562612 is an apocalyptic number.

It is an amenable number.

121557562612 is a deficient number, since it is larger than the sum of its proper divisors (91168171966).

121557562612 is a wasteful number, since it uses less digits than its factorization.

121557562612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30389390657 (or 30389390655 counting only the distinct ones).

The product of its digits is 252000, while the sum is 43.

The spelling of 121557562612 in words is "one hundred twenty-one billion, five hundred fifty-seven million, five hundred sixty-two thousand, six hundred twelve".