21220022111212 has 12 divisors (see below), whose sum is σ = 37135080901800. Its totient is φ = 10609998996416.

The previous prime is 21220022111177. The next prime is 21220022111261. The reversal of 21220022111212 is 21211122002212.

It is a super-2 number, since 2×21220022111212² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21220022111212.

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, 1798164 + ... + 6758212.

It is an arithmetic number, because the mean of its divisors is an integer number (3094590075150).

Almost surely, 2^{21220022111212} is an apocalyptic number.

It is an amenable number.

21220022111212 is a deficient number, since it is larger than the sum of its proper divisors (15915058790588).

21220022111212 is a wasteful number, since it uses less digits than its factorization.

21220022111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6029600 (or 6029598 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21220022111212 its reverse (21211122002212), we get a palindrome (42431144113424).

The spelling of 21220022111212 in words is "twenty-one trillion, two hundred twenty billion, twenty-two million, one hundred eleven thousand, two hundred twelve".