21224353631212 has 24 divisors (see below), whose sum is σ = 39097675640240. Its totient is φ = 10053594365760.

The previous prime is 21224353631203. The next prime is 21224353631213. The reversal of 21224353631212 is 21213635342212.

It is not an unprimeable number, because it can be changed into a prime (21224353631213) 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, 20101078 + ... + 21130594.

Almost surely, 2^{21224353631212} is an apocalyptic number.

It is an amenable number.

21224353631212 is a deficient number, since it is larger than the sum of its proper divisors (17873322009028).

21224353631212 is a wasteful number, since it uses less digits than its factorization.

21224353631212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300801 (or 1300799 counting only the distinct ones).

The product of its digits is 103680, while the sum is 37.

Adding to 21224353631212 its reverse (21213635342212), we get a palindrome (42437988973424).

The spelling of 21224353631212 in words is "twenty-one trillion, two hundred twenty-four billion, three hundred fifty-three million, six hundred thirty-one thousand, two hundred twelve".