21212222101212 has 24 divisors (see below), whose sum is σ = 49495480157200. Its totient is φ = 7070698521216.

The previous prime is 21212222101177. The next prime is 21212222101337. The reversal of 21212222101212 is 21210122221212.

It is a super-2 number, since 2×21212222101212² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3142537 + ... + 7231872.

Almost surely, 2^{21212222101212} is an apocalyptic number.

It is an amenable number.

21212222101212 is an abundant number, since it is smaller than the sum of its proper divisors (28283258055988).

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

21212222101212 is a wasteful number, since it uses less digits than its factorization.

21212222101212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10544805 (or 10544803 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21212222101212 its reverse (21210122221212), we get a palindrome (42422344322424).

The spelling of 21212222101212 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty-two million, one hundred one thousand, two hundred twelve".