21222010101221 has 4 divisors (see below), whose sum is σ = 21222072640032. Its totient is φ = 21221947562412.

The previous prime is 21222010101209. The next prime is 21222010101223. The reversal of 21222010101221 is 12210101022212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222010101221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21222010101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222010101223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30757601 + ... + 31440006.

It is an arithmetic number, because the mean of its divisors is an integer number (5305518160008).

Almost surely, 2^{21222010101221} is an apocalyptic number.

It is an amenable number.

21222010101221 is a deficient number, since it is larger than the sum of its proper divisors (62538811).

21222010101221 is an equidigital number, since it uses as much as digits as its factorization.

21222010101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62538810.

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

Adding to 21222010101221 its reverse (12210101022212), we get a palindrome (33432111123433).

The spelling of 21222010101221 in words is "twenty-one trillion, two hundred twenty-two billion, ten million, one hundred one thousand, two hundred twenty-one".