21222120210012 has 72 divisors (see below), whose sum is σ = 54447656639376. Its totient is φ = 6968177846784.

The previous prime is 21222120209981. The next prime is 21222120210037. The reversal of 21222120210012 is 21001202122212.

It is a happy number.

21222120210012 is a `hidden beast` number, since 212 + 221 + 20 + 210 + 0 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64944138 + ... + 65270094.

Almost surely, 2^{21222120210012} is an apocalyptic number.

It is an amenable number.

21222120210012 is an abundant number, since it is smaller than the sum of its proper divisors (33225536429364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21222120210012 is a wasteful number, since it uses less digits than its factorization.

21222120210012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353027 (or 353022 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21222120210012 its reverse (21001202122212), we get a palindrome (42223322332224).

The spelling of 21222120210012 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, two hundred ten thousand, twelve".