121101780 has 48 divisors (see below), whose sum is σ = 339562944. Its totient is φ = 32248320.

The previous prime is 121101749. The next prime is 121101787. The reversal of 121101780 is 87101121.

It is a super-2 number, since 2×121101780² = 29331282238336800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121101787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80919 + ... + 82401.

It is an arithmetic number, because the mean of its divisors is an integer number (7074228).

Almost surely, 2^121101780 is an apocalyptic number.

121101780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121101780 is an abundant number, since it is smaller than the sum of its proper divisors (218461164).

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

121101780 is a wasteful number, since it uses less digits than its factorization.

121101780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2856 (or 2854 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 21.

The square root of 121101780 is about 11004.6253911708. The cubic root of 121101780 is about 494.7473866654.

The spelling of 121101780 in words is "one hundred twenty-one million, one hundred one thousand, seven hundred eighty".