22081213 has 24 divisors (see below), whose sum is σ = 28465344. Its totient is φ = 16934400.

The previous prime is 22081187. The next prime is 22081253. The reversal of 22081213 is 31218022.

It is not a de Polignac number, because 22081213 - 2¹⁷ = 21950141 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 (22081253) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37981 + ... + 38557.

It is an arithmetic number, because the mean of its divisors is an integer number (1186056).

Almost surely, 2^22081213 is an apocalyptic number.

It is an amenable number.

22081213 is a deficient number, since it is larger than the sum of its proper divisors (6384131).

22081213 is a wasteful number, since it uses less digits than its factorization.

22081213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673 (or 666 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 22081213 is about 4699.0651197871. The cubic root of 22081213 is about 280.5483006079.

Adding to 22081213 its reverse (31218022), we get a palindrome (53299235).

The spelling of 22081213 in words is "twenty-two million, eighty-one thousand, two hundred thirteen".