21223142212 has 12 divisors (see below), whose sum is σ = 37432944640. Its totient is φ = 10528015176.

The previous prime is 21223142207. The next prime is 21223142219. The reversal of 21223142212 is 21224132212.

It is not an unprimeable number, because it can be changed into a prime (21223142219) 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, 20888412 + ... + 20889427.

Almost surely, 2^21223142212 is an apocalyptic number.

It is an amenable number.

21223142212 is a deficient number, since it is larger than the sum of its proper divisors (16209802428).

21223142212 is a wasteful number, since it uses less digits than its factorization.

21223142212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41777970 (or 41777968 counting only the distinct ones).

The product of its digits is 768, while the sum is 22.

Adding to 21223142212 its reverse (21224132212), we get a palindrome (42447274424).

The spelling of 21223142212 in words is "twenty-one billion, two hundred twenty-three million, one hundred forty-two thousand, two hundred twelve".