121097780 has 24 divisors (see below), whose sum is σ = 262510080. Its totient is φ = 46876320.

The previous prime is 121097771. The next prime is 121097797. The reversal of 121097780 is 87790121.

It is a self number, because there is not a number n which added to its sum of digits gives 121097780.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97040 + ... + 98279.

It is an arithmetic number, because the mean of its divisors is an integer number (10937920).

Almost surely, 2^121097780 is an apocalyptic number.

121097780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121097780 is an abundant number, since it is smaller than the sum of its proper divisors (141412300).

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

121097780 is a wasteful number, since it uses less digits than its factorization.

121097780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195359 (or 195357 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 121097780 is about 11004.4436479088. The cubic root of 121097780 is about 494.7419394255.

The spelling of 121097780 in words is "one hundred twenty-one million, ninety-seven thousand, seven hundred eighty".