2121301220 has 24 divisors (see below), whose sum is σ = 4467585024. Its totient is φ = 846072416.

The previous prime is 2121301219. The next prime is 2121301249. The reversal of 2121301220 is 221031212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2121301195 and 2121301204.

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, 145892 + ... + 159771.

It is an arithmetic number, because the mean of its divisors is an integer number (186149376).

Almost surely, 2^2121301220 is an apocalyptic number.

2121301220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121301220 is an abundant number, since it is smaller than the sum of its proper divisors (2346283804).

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

2121301220 is a wasteful number, since it uses less digits than its factorization.

2121301220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306019 (or 306017 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2121301220 is about 46057.5859115521. The cubic root of 2121301220 is about 1284.8944323233.

Adding to 2121301220 its reverse (221031212), we get a palindrome (2342332432).

The spelling of 2121301220 in words is "two billion, one hundred twenty-one million, three hundred one thousand, two hundred twenty".