21211320222 has 48 divisors (see below), whose sum is σ = 48110519808. Its totient is φ = 6741242640.

The previous prime is 21211320203. The next prime is 21211320227. The reversal of 21211320222 is 22202311212.

21211320222 is a `hidden beast` number, since 2 + 121 + 1 + 320 + 222 = 666.

It is a super-2 number, since 2×21211320222² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21211320195 and 21211320204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211320227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46383 + ... + 211125.

It is an arithmetic number, because the mean of its divisors is an integer number (1002302496).

Almost surely, 2^21211320222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21211320222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24055259904).

21211320222 is an abundant number, since it is smaller than the sum of its proper divisors (26899199586).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21211320222 is a wasteful number, since it uses less digits than its factorization.

21211320222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165085 (or 165082 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21211320222 its reverse (22202311212), we get a palindrome (43413631434).

The spelling of 21211320222 in words is "twenty-one billion, two hundred eleven million, three hundred twenty thousand, two hundred twenty-two".