21220220100212 has 12 divisors (see below), whose sum is σ = 42440440200480. Its totient is φ = 9094380042936.

The previous prime is 21220220100137. The next prime is 21220220100257. The reversal of 21220220100212 is 21200102202212.

It is a happy number.

21220220100212 is an admirable number.

It is a super-2 number, since 2×21220220100212² (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 3 ways as a sum of consecutive naturals, for example, 378932501762 + ... + 378932501817.

It is an arithmetic number, because the mean of its divisors is an integer number (3536703350040).

Almost surely, 2^{21220220100212} is an apocalyptic number.

It is an amenable number.

21220220100212 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21220220100212 is a wasteful number, since it uses less digits than its factorization.

21220220100212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757865003590 (or 757865003588 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21220220100212 its reverse (21200102202212), we get a palindrome (42420322302424).

The spelling of 21220220100212 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty million, one hundred thousand, two hundred twelve".