2221515252 has 72 divisors (see below), whose sum is σ = 6199895520. Its totient is φ = 665065920.

The previous prime is 2221515229. The next prime is 2221515253. The reversal of 2221515252 is 2525151222.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221515253) 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, 927 + ... + 66662.

It is an arithmetic number, because the mean of its divisors is an integer number (86109660).

Almost surely, 2^2221515252 is an apocalyptic number.

2221515252 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2221515252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3099947760).

2221515252 is an abundant number, since it is smaller than the sum of its proper divisors (3978380268).

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

2221515252 is a wasteful number, since it uses less digits than its factorization.

2221515252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67693 (or 67688 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 2221515252 is about 47132.9529310439. The cubic root of 2221515252 is about 1304.8174809696.

Adding to 2221515252 its reverse (2525151222), we get a palindrome (4746666474).

The spelling of 2221515252 in words is "two billion, two hundred twenty-one million, five hundred fifteen thousand, two hundred fifty-two".