2121130221 has 16 divisors (see below), whose sum is σ = 3236279424. Its totient is φ = 1210544064.

The previous prime is 2121130211. The next prime is 2121130237. The reversal of 2121130221 is 1220311212.

It is not a de Polignac number, because 2121130221 - 2¹⁷ = 2120999149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2121130221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121130211) 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, 46630 + ... + 80103.

It is an arithmetic number, because the mean of its divisors is an integer number (202267464).

Almost surely, 2^2121130221 is an apocalyptic number.

2121130221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2121130221 is a deficient number, since it is larger than the sum of its proper divisors (1115149203).

2121130221 is a wasteful number, since it uses less digits than its factorization.

2121130221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127540.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2121130221 is about 46055.7295132755. The cubic root of 2121130221 is about 1284.8599060987.

Adding to 2121130221 its reverse (1220311212), we get a palindrome (3341441433).

The spelling of 2121130221 in words is "two billion, one hundred twenty-one million, one hundred thirty thousand, two hundred twenty-one".