22010220212221 has 4 divisors (see below), whose sum is σ = 23304939048252. Its totient is φ = 20715501376192.

The previous prime is 22010220212191. The next prime is 22010220212273. The reversal of 22010220212221 is 12221202201022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15705852489721 + 6304367722500 = 3963061^2 + 2510850^2 .

It is a cyclic number.

It is not a de Polignac number, because 22010220212221 - 2¹⁷ = 22010220081149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22010220212621) 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, 647359417990 + ... + 647359418023.

It is an arithmetic number, because the mean of its divisors is an integer number (5826234762063).

Almost surely, 2^{22010220212221} is an apocalyptic number.

It is an amenable number.

22010220212221 is a deficient number, since it is larger than the sum of its proper divisors (1294718836031).

22010220212221 is a wasteful number, since it uses less digits than its factorization.

22010220212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294718836030.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 22010220212221 its reverse (12221202201022), we get a palindrome (34231422413243).

The spelling of 22010220212221 in words is "twenty-two trillion, ten billion, two hundred twenty million, two hundred twelve thousand, two hundred twenty-one".