21022220012 has 12 divisors (see below), whose sum is σ = 36794293536. Its totient is φ = 10509564720.

The previous prime is 21022219909. The next prime is 21022220017. The reversal of 21022220012 is 21002222012.

It is not an unprimeable number, because it can be changed into a prime (21022220017) 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, 355439 + ... + 410342.

It is an arithmetic number, because the mean of its divisors is an integer number (3066191128).

Almost surely, 2^21022220012 is an apocalyptic number.

It is an amenable number.

21022220012 is a deficient number, since it is larger than the sum of its proper divisors (15772073524).

21022220012 is a wasteful number, since it uses less digits than its factorization.

21022220012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772648 (or 772646 counting only the distinct ones).

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

Adding to 21022220012 its reverse (21002222012), we get a palindrome (42024442024).

The spelling of 21022220012 in words is "twenty-one billion, twenty-two million, two hundred twenty thousand, twelve".