2125201221 has 24 divisors (see below), whose sum is σ = 3606404256. Its totient is φ = 1188923040.

The previous prime is 2125201217. The next prime is 2125201259. The reversal of 2125201221 is 1221025212.

2125201221 is a `hidden beast` number, since 21 + 2 + 520 + 122 + 1 = 666.

It is not a de Polignac number, because 2125201221 - 2² = 2125201217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2125201194 and 2125201203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2125201271) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 824355 + ... + 826928.

It is an arithmetic number, because the mean of its divisors is an integer number (150266844).

Almost surely, 2^2125201221 is an apocalyptic number.

It is an amenable number.

2125201221 is a deficient number, since it is larger than the sum of its proper divisors (1481203035).

2125201221 is a wasteful number, since it uses less digits than its factorization.

2125201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651313 (or 1651310 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 2125201221 is about 46099.9047829819. The cubic root of 2125201221 is about 1285.6813741152.

Adding to 2125201221 its reverse (1221025212), we get a palindrome (3346226433).

The spelling of 2125201221 in words is "two billion, one hundred twenty-five million, two hundred one thousand, two hundred twenty-one".