21220110100212 has 24 divisors (see below), whose sum is σ = 51110802822912. Its totient is φ = 6845196806400.

The previous prime is 21220110100201. The next prime is 21220110100219. The reversal of 21220110100212 is 21200101102212.

It is a junction number, because it is equal to n+sod(n) for n = 21220110100191 and 21220110100200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220110100219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28521652989 + ... + 28521653732.

It is an arithmetic number, because the mean of its divisors is an integer number (2129616784288).

Almost surely, 2^{21220110100212} is an apocalyptic number.

It is an amenable number.

21220110100212 is an abundant number, since it is smaller than the sum of its proper divisors (29890692722700).

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

21220110100212 is a wasteful number, since it uses less digits than its factorization.

21220110100212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57043306759 (or 57043306757 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21220110100212 its reverse (21200101102212), we get a palindrome (42420211202424).

The spelling of 21220110100212 in words is "twenty-one trillion, two hundred twenty billion, one hundred ten million, one hundred thousand, two hundred twelve".