2121199980 has 48 divisors (see below), whose sum is σ = 5998182624. Its totient is φ = 560051200.

The previous prime is 2121199979. The next prime is 2121199987. The reversal of 2121199980 is 899911212.

It is not an unprimeable number, because it can be changed into a prime (2121199987) 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, 168957 + ... + 181076.

It is an arithmetic number, because the mean of its divisors is an integer number (124962138).

Almost surely, 2^2121199980 is an apocalyptic number.

2121199980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121199980 is an abundant number, since it is smaller than the sum of its proper divisors (3876982644).

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

2121199980 is a wasteful number, since it uses less digits than its factorization.

2121199980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350146 (or 350144 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 42.

The square root of 2121199980 is about 46056.4868395322. The cubic root of 2121199980 is about 1284.8739912876.

The spelling of 2121199980 in words is "two billion, one hundred twenty-one million, one hundred ninety-nine thousand, nine hundred eighty".