121561276272 has 20 divisors (see below), whose sum is σ = 314033297160. Its totient is φ = 40520425408.

The previous prime is 121561276267. The next prime is 121561276273. The reversal of 121561276272 is 272672165121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121561276273) 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, 1266263247 + ... + 1266263342.

It is an arithmetic number, because the mean of its divisors is an integer number (15701664858).

Almost surely, 2^121561276272 is an apocalyptic number.

121561276272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121561276272 is an abundant number, since it is smaller than the sum of its proper divisors (192472020888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121561276272 is a wasteful number, since it uses less digits than its factorization.

121561276272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2532526600 (or 2532526594 counting only the distinct ones).

The product of its digits is 141120, while the sum is 42.

The spelling of 121561276272 in words is "one hundred twenty-one billion, five hundred sixty-one million, two hundred seventy-six thousand, two hundred seventy-two".