2213257021 has 4 divisors (see below), whose sum is σ = 2213965692. Its totient is φ = 2212548352.

The previous prime is 2213257019. The next prime is 2213257031. The reversal of 2213257021 is 1207523122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1336268025 + 876988996 = 36555^2 + 29614^2 .

It is a cyclic number.

It is not a de Polignac number, because 2213257021 - 2¹ = 2213257019 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 (2213257031) 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, 349630 + ... + 355903.

It is an arithmetic number, because the mean of its divisors is an integer number (553491423).

Almost surely, 2^2213257021 is an apocalyptic number.

It is an amenable number.

2213257021 is a deficient number, since it is larger than the sum of its proper divisors (708671).

2213257021 is an equidigital number, since it uses as much as digits as its factorization.

2213257021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708670.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 2213257021 is about 47045.2656597877. The cubic root of 2213257021 is about 1303.1986363517.

The spelling of 2213257021 in words is "two billion, two hundred thirteen million, two hundred fifty-seven thousand, twenty-one".