2211216651 has 32 divisors (see below), whose sum is σ = 3790105600. Its totient is φ = 1263543624.

The previous prime is 2211216643. The next prime is 2211216653. The reversal of 2211216651 is 1566121122.

2211216651 is a `hidden beast` number, since 2 + 2 + 1 + 1 + 2 + 1 + 6 + 651 = 666.

2211216651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2211216651 - 2³ = 2211216643 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211216653) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56911 + ... + 87528.

It is an arithmetic number, because the mean of its divisors is an integer number (118440800).

Almost surely, 2^2211216651 is an apocalyptic number.

2211216651 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2211216651 is a deficient number, since it is larger than the sum of its proper divisors (1578888949).

2211216651 is an frugal number, since it uses more digits than its factorization.

2211216651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144467 (or 144449 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 2211216651 is about 47023.5754808160. The cubic root of 2211216651 is about 1302.7980464977.

Adding to 2211216651 its reverse (1566121122), we get a palindrome (3777337773).

The spelling of 2211216651 in words is "two billion, two hundred eleven million, two hundred sixteen thousand, six hundred fifty-one".