21220211110212 has 72 divisors (see below), whose sum is σ = 53662811483736. Its totient is φ = 7070393401344.

The previous prime is 21220211110181. The next prime is 21220211110249. The reversal of 21220211110212 is 21201111202212.

21220211110212 is a `hidden beast` number, since 21 + 220 + 211 + 1 + 1 + 0 + 212 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2279906724096 + 18940304386116 = 1509936^2 + 4352046^2 .

It is a super-2 number, since 2×21220211110212² (a number of 27 digits) contains 22 as substring.

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

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, 1469841858 + ... + 1469856294.

It is an arithmetic number, because the mean of its divisors is an integer number (745316826163).

Almost surely, 2^{21220211110212} is an apocalyptic number.

It is an amenable number.

21220211110212 is an abundant number, since it is smaller than the sum of its proper divisors (32442600373524).

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

21220211110212 is a wasteful number, since it uses less digits than its factorization.

21220211110212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28997 (or 28992 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21220211110212 its reverse (21201111202212), we get a palindrome (42421322312424).

The spelling of 21220211110212 in words is "twenty-one trillion, two hundred twenty billion, two hundred eleven million, one hundred ten thousand, two hundred twelve".