121475820 has 24 divisors (see below), whose sum is σ = 340132464. Its totient is φ = 32393536.

The previous prime is 121475807. The next prime is 121475843. The reversal of 121475820 is 28574121.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 1012239 + ... + 1012358.

It is an arithmetic number, because the mean of its divisors is an integer number (14172186).

Almost surely, 2^121475820 is an apocalyptic number.

121475820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121475820 is an abundant number, since it is smaller than the sum of its proper divisors (218656644).

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

121475820 is a wasteful number, since it uses less digits than its factorization.

121475820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2024609 (or 2024607 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 121475820 is about 11021.6069608746. The cubic root of 121475820 is about 495.2562289400.

The spelling of 121475820 in words is "one hundred twenty-one million, four hundred seventy-five thousand, eight hundred twenty".