21122212232 has 16 divisors (see below), whose sum is σ = 43204525200. Its totient is φ = 9601005520.

The previous prime is 21122212231. The next prime is 21122212247. The reversal of 21122212232 is 23221222112.

It is a super-2 number, since 2×21122212232² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21122212231) 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, 120012482 + ... + 120012657.

It is an arithmetic number, because the mean of its divisors is an integer number (2700282825).

Almost surely, 2^21122212232 is an apocalyptic number.

21122212232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21122212232 is an abundant number, since it is smaller than the sum of its proper divisors (22082312968).

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

21122212232 is a wasteful number, since it uses less digits than its factorization.

21122212232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240025156 (or 240025152 counting only the distinct ones).

The product of its digits is 384, while the sum is 20.

Adding to 21122212232 its reverse (23221222112), we get a palindrome (44343434344).

The spelling of 21122212232 in words is "twenty-one billion, one hundred twenty-two million, two hundred twelve thousand, two hundred thirty-two".