2215253021 has 4 divisors (see below), whose sum is σ = 2262386112. Its totient is φ = 2168119932.

The previous prime is 2215253009. The next prime is 2215253023. The reversal of 2215253021 is 1203525122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2215253021 - 2¹⁴ = 2215236637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2215253023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23566475 + ... + 23566568.

It is an arithmetic number, because the mean of its divisors is an integer number (565596528).

Almost surely, 2^2215253021 is an apocalyptic number.

It is an amenable number.

2215253021 is a deficient number, since it is larger than the sum of its proper divisors (47133091).

2215253021 is an equidigital number, since it uses as much as digits as its factorization.

2215253021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47133090.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 2215253021 is about 47066.4744908730. The cubic root of 2215253021 is about 1303.5902768007.

Adding to 2215253021 its reverse (1203525122), we get a palindrome (3418778143).

The spelling of 2215253021 in words is "two billion, two hundred fifteen million, two hundred fifty-three thousand, twenty-one".