121155420 has 24 divisors (see below), whose sum is σ = 339235344. Its totient is φ = 32308096.

The previous prime is 121155407. The next prime is 121155431. The reversal of 121155420 is 24551121.

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, 1009569 + ... + 1009688.

It is an arithmetic number, because the mean of its divisors is an integer number (14134806).

Almost surely, 2^121155420 is an apocalyptic number.

121155420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121155420 is an abundant number, since it is smaller than the sum of its proper divisors (218079924).

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

121155420 is a wasteful number, since it uses less digits than its factorization.

121155420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2019269 (or 2019267 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 121155420 is about 11007.0622783738. The cubic root of 121155420 is about 494.8204225656.

The spelling of 121155420 in words is "one hundred twenty-one million, one hundred fifty-five thousand, four hundred twenty".