21211131222 has 48 divisors (see below), whose sum is σ = 47562269040. Its totient is φ = 6823688256.

The previous prime is 21211131211. The next prime is 21211131233. The reversal of 21211131222 is 22213111212.

It is an interprime number because it is at equal distance from previous prime (21211131211) and next prime (21211131233).

It is a super-3 number, since 3×21211131222³ (a number of 32 digits) contains 333 as substring.

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

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21211131195 and 21211131204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1473753 + ... + 1488075.

It is an arithmetic number, because the mean of its divisors is an integer number (990880605).

Almost surely, 2^21211131222 is an apocalyptic number.

21211131222 is an abundant number, since it is smaller than the sum of its proper divisors (26351137818).

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

21211131222 is a wasteful number, since it uses less digits than its factorization.

21211131222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17197 (or 17194 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

Adding to 21211131222 its reverse (22213111212), we get a palindrome (43424242434).

The spelling of 21211131222 in words is "twenty-one billion, two hundred eleven million, one hundred thirty-one thousand, two hundred twenty-two".