21220110201212 has 48 divisors (see below), whose sum is σ = 40712509656000. Its totient is φ = 9618860613120.

The previous prime is 21220110201203. The next prime is 21220110201319. The reversal of 21220110201212 is 21210201102212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14696864 + ... + 16076007.

It is an arithmetic number, because the mean of its divisors is an integer number (848177284500).

Almost surely, 2^{21220110201212} is an apocalyptic number.

It is an amenable number.

21220110201212 is a deficient number, since it is larger than the sum of its proper divisors (19492399454788).

21220110201212 is a wasteful number, since it uses less digits than its factorization.

21220110201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30773126 (or 30773124 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21220110201212 its reverse (21210201102212), we get a palindrome (42430311303424).

The spelling of 21220110201212 in words is "twenty-one trillion, two hundred twenty billion, one hundred ten million, two hundred one thousand, two hundred twelve".