21220020212 has 12 divisors (see below), whose sum is σ = 37242055200. Its totient is φ = 10579433016.

The previous prime is 21220020187. The next prime is 21220020223. The reversal of 21220020212 is 21202002212.

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, 7642712 + ... + 7645487.

It is an arithmetic number, because the mean of its divisors is an integer number (3103504600).

Almost surely, 2^21220020212 is an apocalyptic number.

It is an amenable number.

21220020212 is a deficient number, since it is larger than the sum of its proper divisors (16022034988).

21220020212 is a wasteful number, since it uses less digits than its factorization.

21220020212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15288550 (or 15288548 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21220020212 its reverse (21202002212), we get a palindrome (42422022424).

The spelling of 21220020212 in words is "twenty-one billion, two hundred twenty million, twenty thousand, two hundred twelve".