21222111021213 has 8 divisors (see below), whose sum is σ = 28306554860800. Its totient is φ = 14142870597888.

The previous prime is 21222111021193. The next prime is 21222111021233. The reversal of 21222111021213 is 31212011122212.

It is an interprime number because it is at equal distance from previous prime (21222111021193) and next prime (21222111021233).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21222111021213 - 2²¹ = 21222108924061 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21222111021213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222111021233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1300844548 + ... + 1300860861.

It is an arithmetic number, because the mean of its divisors is an integer number (3538319357600).

Almost surely, 2^{21222111021213} is an apocalyptic number.

It is an amenable number.

21222111021213 is a deficient number, since it is larger than the sum of its proper divisors (7084443839587).

21222111021213 is a wasteful number, since it uses less digits than its factorization.

21222111021213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2601708131.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 21222111021213 its reverse (31212011122212), we get a palindrome (52434122143425).

The spelling of 21222111021213 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred eleven million, twenty-one thousand, two hundred thirteen".