121561727260 has 24 divisors (see below), whose sum is σ = 255444070896. Its totient is φ = 48593368320.

The previous prime is 121561727207. The next prime is 121561727267. The reversal of 121561727260 is 62727165121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121561727267) 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, 1925826 + ... + 1987945.

It is an arithmetic number, because the mean of its divisors is an integer number (10643502954).

Almost surely, 2^121561727260 is an apocalyptic number.

121561727260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121561727260 is an abundant number, since it is smaller than the sum of its proper divisors (133882343636).

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

121561727260 is a wasteful number, since it uses less digits than its factorization.

121561727260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3915333 (or 3915331 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 40.

The spelling of 121561727260 in words is "one hundred twenty-one billion, five hundred sixty-one million, seven hundred twenty-seven thousand, two hundred sixty".