121154220 has 144 divisors (see below), whose sum is σ = 410522112. Its totient is φ = 28667520.

The previous prime is 121154197. The next prime is 121154227. The reversal of 121154220 is 22451121.

121154220 is a `hidden beast` number, since 121 + 1 + 542 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 121154193 and 121154202.

It is not an unprimeable number, because it can be changed into a prime (121154227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 84429 + ... + 85851.

It is an arithmetic number, because the mean of its divisors is an integer number (2850848).

Almost surely, 2^121154220 is an apocalyptic number.

121154220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121154220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205261056).

121154220 is an abundant number, since it is smaller than the sum of its proper divisors (289367892).

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

121154220 is a wasteful number, since it uses less digits than its factorization.

121154220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1492 (or 1487 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 121154220 is about 11007.0077677814. The cubic root of 121154220 is about 494.8187888886.

The spelling of 121154220 in words is "one hundred twenty-one million, one hundred fifty-four thousand, two hundred twenty".