21223311213 has 16 divisors (see below), whose sum is σ = 30929345216. Its totient is φ = 12865564800.

The previous prime is 21223311167. The next prime is 21223311227. The reversal of 21223311213 is 31211332212.

It is not a de Polignac number, because 21223311213 - 2¹³ = 21223303021 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 21223311213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223311253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4058488 + ... + 4063713.

It is an arithmetic number, because the mean of its divisors is an integer number (1933084076).

Almost surely, 2^21223311213 is an apocalyptic number.

It is an amenable number.

21223311213 is a deficient number, since it is larger than the sum of its proper divisors (9706034003).

21223311213 is a wasteful number, since it uses less digits than its factorization.

21223311213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8122284.

The product of its digits is 432, while the sum is 21.

Adding to 21223311213 its reverse (31211332212), we get a palindrome (52434643425).

It can be divided in two parts, 212233 and 11213, that added together give a triangular number (223446 = T₆₆₈).

The spelling of 21223311213 in words is "twenty-one billion, two hundred twenty-three million, three hundred eleven thousand, two hundred thirteen".