21220022213 has 8 divisors (see below), whose sum is σ = 22902343128. Its totient is φ = 19544845824.

The previous prime is 21220022209. The next prime is 21220022231. The reversal of 21220022213 is 31222002212.

It can be written as a sum of positive squares in 4 ways, for example, as 7611166564 + 13608855649 = 87242^2 + 116657^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21220022213 - 2² = 21220022209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220022191 and 21220022200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220022413) 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, 1779956 + ... + 1791837.

It is an arithmetic number, because the mean of its divisors is an integer number (2862792891).

Almost surely, 2^21220022213 is an apocalyptic number.

It is an amenable number.

21220022213 is a deficient number, since it is larger than the sum of its proper divisors (1682320915).

21220022213 is a wasteful number, since it uses less digits than its factorization.

21220022213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3572263.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21220022213 its reverse (31222002212), we get a palindrome (52442024425).

The spelling of 21220022213 in words is "twenty-one billion, two hundred twenty million, twenty-two thousand, two hundred thirteen".