2513161221 has 16 divisors (see below), whose sum is σ = 3569770944. Its totient is φ = 1567206144.

The previous prime is 2513161219. The next prime is 2513161237. The reversal of 2513161221 is 1221613152.

It is a happy number.

It is not a de Polignac number, because 2513161221 - 2¹ = 2513161219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2513161191 and 2513161200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2513161201) 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, 142846 + ... + 159471.

It is an arithmetic number, because the mean of its divisors is an integer number (223110684).

Almost surely, 2^2513161221 is an apocalyptic number.

It is an amenable number.

2513161221 is a deficient number, since it is larger than the sum of its proper divisors (1056609723).

2513161221 is a wasteful number, since it uses less digits than its factorization.

2513161221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302500.

The product of its digits is 720, while the sum is 24.

The square root of 2513161221 is about 50131.4394467185. The cubic root of 2513161221 is about 1359.5863110629.

Adding to 2513161221 its reverse (1221613152), we get a palindrome (3734774373).

The spelling of 2513161221 in words is "two billion, five hundred thirteen million, one hundred sixty-one thousand, two hundred twenty-one".