22221211010021 has 4 divisors (see below), whose sum is σ = 23528341069452. Its totient is φ = 20914080950592.

The previous prime is 22221211009973. The next prime is 22221211010081. The reversal of 22221211010021 is 12001011212222.

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 15131213092996 + 7089997917025 = 3889886^2 + 2662705^2 .

It is a cyclic number.

It is not a de Polignac number, because 22221211010021 - 2⁶ = 22221211009957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 1307130059413 = 22221211010021 / (2 + 2 + 2 + 2 + 1 + 2 + 1 + 1 + 0 + 1 + 0 + 0 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221211010081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 653565029690 + ... + 653565029723.

It is an arithmetic number, because the mean of its divisors is an integer number (5882085267363).

Almost surely, 2^{22221211010021} is an apocalyptic number.

It is an amenable number.

22221211010021 is a deficient number, since it is larger than the sum of its proper divisors (1307130059431).

22221211010021 is a wasteful number, since it uses less digits than its factorization.

22221211010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307130059430.

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

Adding to 22221211010021 its reverse (12001011212222), we get a palindrome (34222222222243).

The spelling of 22221211010021 in words is "twenty-two trillion, two hundred twenty-one billion, two hundred eleven million, ten thousand, twenty-one".