2216021257 has 4 divisors (see below), whose sum is σ = 2247232896. Its totient is φ = 2184809620.

The previous prime is 2216021251. The next prime is 2216021287. The reversal of 2216021257 is 7521206122.

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 a de Polignac number, because none of the positive numbers 2^k-2216021257 is a prime.

It is a super-2 number, since 2×2216021257² = 9821500422951720098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2216021251) 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, 15605713 + ... + 15605854.

It is an arithmetic number, because the mean of its divisors is an integer number (561808224).

Almost surely, 2^2216021257 is an apocalyptic number.

It is an amenable number.

2216021257 is a deficient number, since it is larger than the sum of its proper divisors (31211639).

2216021257 is an equidigital number, since it uses as much as digits as its factorization.

2216021257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31211638.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 2216021257 is about 47074.6349640653. The cubic root of 2216021257 is about 1303.7409517237.

Adding to 2216021257 its reverse (7521206122), we get a palindrome (9737227379).

The spelling of 2216021257 in words is "two billion, two hundred sixteen million, twenty-one thousand, two hundred fifty-seven".