121156020 has 48 divisors (see below), whose sum is σ = 376931520. Its totient is φ = 32308128.

The previous prime is 121156003. The next prime is 121156037. The reversal of 121156020 is 20651121.

It is an interprime number because it is at equal distance from previous prime (121156003) and next prime (121156037).

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 = 121155984 and 121156002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111642 + ... + 112721.

It is an arithmetic number, because the mean of its divisors is an integer number (7852740).

Almost surely, 2^121156020 is an apocalyptic number.

121156020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121156020 is an abundant number, since it is smaller than the sum of its proper divisors (255775500).

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

121156020 is a wasteful number, since it uses less digits than its factorization.

121156020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224381 (or 224373 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 121156020 is about 11007.0895335688. The cubic root of 121156020 is about 494.8212394001.

The spelling of 121156020 in words is "one hundred twenty-one million, one hundred fifty-six thousand, twenty".