22001110221221 has 4 divisors (see below), whose sum is σ = 22092401135244. Its totient is φ = 21909819307200.

The previous prime is 22001110221199. The next prime is 22001110221269. The reversal of 22001110221221 is 12212201110022.

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 6920508830596 + 15080601390625 = 2630686^2 + 3883375^2 .

It is a cyclic number.

It is not a de Polignac number, because 22001110221221 - 2²² = 22001106026917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22001110221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001110221121) 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, 45645456650 + ... + 45645457131.

It is an arithmetic number, because the mean of its divisors is an integer number (5523100283811).

Almost surely, 2^{22001110221221} is an apocalyptic number.

It is an amenable number.

22001110221221 is a deficient number, since it is larger than the sum of its proper divisors (91290914023).

22001110221221 is an equidigital number, since it uses as much as digits as its factorization.

22001110221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91290914022.

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

Adding to 22001110221221 its reverse (12212201110022), we get a palindrome (34213311331243).

The spelling of 22001110221221 in words is "twenty-two trillion, one billion, one hundred ten million, two hundred twenty-one thousand, two hundred twenty-one".