22221221110021 has 4 divisors (see below), whose sum is σ = 23390759063200. Its totient is φ = 21051683156844.

The previous prime is 22221221110013. The next prime is 22221221110037. The reversal of 22221221110021 is 12001112212222.

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 not a de Polignac number, because 22221221110021 - 2³ = 22221221110013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1169537953159 = 22221221110021 / (2 + 2 + 2 + 2 + 1 + 2 + 2 + 1 + 1 + 1 + 0 + 0 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221221110091) 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, 584768976561 + ... + 584768976598.

It is an arithmetic number, because the mean of its divisors is an integer number (5847689765800).

Almost surely, 2^{22221221110021} is an apocalyptic number.

It is an amenable number.

22221221110021 is a deficient number, since it is larger than the sum of its proper divisors (1169537953179).

22221221110021 is a wasteful number, since it uses less digits than its factorization.

22221221110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1169537953178.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 22221221110021 its reverse (12001112212222), we get a palindrome (34222333322243).

The spelling of 22221221110021 in words is "twenty-two trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred ten thousand, twenty-one".