2213526821 has 16 divisors (see below), whose sum is σ = 2539703808. Its totient is φ = 1910625600.

The previous prime is 2213526793. The next prime is 2213526827. The reversal of 2213526821 is 1286253122.

It is a cyclic number.

It is not a de Polignac number, because 2213526821 - 2²⁶ = 2146417957 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 (2213526827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43166 + ... + 79311.

It is an arithmetic number, because the mean of its divisors is an integer number (158731488).

Almost surely, 2^2213526821 is an apocalyptic number.

It is an amenable number.

2213526821 is a deficient number, since it is larger than the sum of its proper divisors (326176987).

2213526821 is a wasteful number, since it uses less digits than its factorization.

2213526821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122572.

The product of its digits is 11520, while the sum is 32.

The square root of 2213526821 is about 47048.1330235324. The cubic root of 2213526821 is about 1303.2515882838.

Adding to 2213526821 its reverse (1286253122), we get a palindrome (3499779943).

The spelling of 2213526821 in words is "two billion, two hundred thirteen million, five hundred twenty-six thousand, eight hundred twenty-one".