21220113213 has 16 divisors (see below), whose sum is σ = 33855451840. Its totient is φ = 13058530992.

The previous prime is 21220113209. The next prime is 21220113221. The reversal of 21220113213 is 31231102212.

It is not a de Polignac number, because 21220113213 - 2² = 21220113209 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 (21220113253) 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, 30227731 + ... + 30228432.

It is an arithmetic number, because the mean of its divisors is an integer number (2115965740).

Almost surely, 2^21220113213 is an apocalyptic number.

It is an amenable number.

21220113213 is a deficient number, since it is larger than the sum of its proper divisors (12635338627).

21220113213 is a wasteful number, since it uses less digits than its factorization.

21220113213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60456185 (or 60456179 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21220113213 its reverse (31231102212), we get a palindrome (52451215425).

The spelling of 21220113213 in words is "twenty-one billion, two hundred twenty million, one hundred thirteen thousand, two hundred thirteen".