21222111212012 has 24 divisors (see below), whose sum is σ = 37747827161520. Its totient is φ = 10437020516160.

The previous prime is 21222111212009. The next prime is 21222111212033. The reversal of 21222111212012 is 21021211122212.

It is a super-2 number, since 2×21222111212012² (a number of 27 digits) contains 22 as substring.

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, 39716198 + ... + 40246994.

It is an arithmetic number, because the mean of its divisors is an integer number (1572826131730).

Almost surely, 2^{21222111212012} is an apocalyptic number.

It is an amenable number.

21222111212012 is a deficient number, since it is larger than the sum of its proper divisors (16525715949508).

21222111212012 is a wasteful number, since it uses less digits than its factorization.

21222111212012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694721 (or 694719 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21222111212012 its reverse (21021211122212), we get a palindrome (42243322334224).

The spelling of 21222111212012 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred eleven million, two hundred twelve thousand, twelve".