21222120101012 has 12 divisors (see below), whose sum is σ = 37139284971936. Its totient is φ = 10610895823320.

The previous prime is 21222120100999. The next prime is 21222120101033. The reversal of 21222120101012 is 21010102122212.

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, 40765814 + ... + 41283117.

It is an arithmetic number, because the mean of its divisors is an integer number (3094940414328).

Almost surely, 2^{21222120101012} is an apocalyptic number.

It is an amenable number.

21222120101012 is a deficient number, since it is larger than the sum of its proper divisors (15917164870924).

21222120101012 is a wasteful number, since it uses less digits than its factorization.

21222120101012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82113598 (or 82113596 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21222120101012 its reverse (21010102122212), we get a palindrome (42232222223224).

The spelling of 21222120101012 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, one hundred one thousand, twelve".