21220002021212 has 12 divisors (see below), whose sum is σ = 38415520900680. Its totient is φ = 10244138906736.

The previous prime is 21220002021203. The next prime is 21220002021227. The reversal of 21220002021212 is 21212020002212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91465525838 + ... + 91465526069.

It is an arithmetic number, because the mean of its divisors is an integer number (3201293408390).

Almost surely, 2^{21220002021212} is an apocalyptic number.

It is an amenable number.

21220002021212 is a deficient number, since it is larger than the sum of its proper divisors (17195518879468).

21220002021212 is a wasteful number, since it uses less digits than its factorization.

21220002021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182931051940 (or 182931051938 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21220002021212 its reverse (21212020002212), we get a palindrome (42432022023424).

The spelling of 21220002021212 in words is "twenty-one trillion, two hundred twenty billion, two million, twenty-one thousand, two hundred twelve".