21212022220313 has 4 divisors (see below), whose sum is σ = 21354384785700. Its totient is φ = 21069659654928.

The previous prime is 21212022220241. The next prime is 21212022220327. The reversal of 21212022220313 is 31302222021212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12704113304089 + 8507908916224 = 3564283^2 + 2916832^2 .

It is a cyclic number.

It is not a de Polignac number, because 21212022220313 - 2¹⁴ = 21212022203929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212022220373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71181282470 + ... + 71181282767.

It is an arithmetic number, because the mean of its divisors is an integer number (5338596196425).

Almost surely, 2^{21212022220313} is an apocalyptic number.

It is an amenable number.

21212022220313 is a deficient number, since it is larger than the sum of its proper divisors (142362565387).

21212022220313 is a wasteful number, since it uses less digits than its factorization.

21212022220313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142362565386.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21212022220313 its reverse (31302222021212), we get a palindrome (52514244241525).

The spelling of 21212022220313 in words is "twenty-one trillion, two hundred twelve billion, twenty-two million, two hundred twenty thousand, three hundred thirteen".