21212122332 has 24 divisors (see below), whose sum is σ = 49498621200. Its totient is φ = 7070183296.

The previous prime is 21212122307. The next prime is 21212122333. The reversal of 21212122332 is 23322121212.

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 = 21212122299 and 21212122308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212122333) 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, 125344 + ... + 241112.

It is an arithmetic number, because the mean of its divisors is an integer number (2062442550).

Almost surely, 2^21212122332 is an apocalyptic number.

It is an amenable number.

21212122332 is an abundant number, since it is smaller than the sum of its proper divisors (28286498868).

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

21212122332 is a wasteful number, since it uses less digits than its factorization.

21212122332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131045 (or 131043 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

Adding to 21212122332 its reverse (23322121212), we get a palindrome (44534243544).

The spelling of 21212122332 in words is "twenty-one billion, two hundred twelve million, one hundred twenty-two thousand, three hundred thirty-two".