22111222010021 has 4 divisors (see below), whose sum is σ = 22116250720812. Its totient is φ = 22106193299232.

The previous prime is 22111222009993. The next prime is 22111222010027. The reversal of 22111222010021 is 12001022211122.

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 12452888188225 + 9658333821796 = 3528865^2 + 3107786^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22111222010021 is a prime.

It is a super-2 number, since 2×22111222010021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22111222010027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2514348800 + ... + 2514357593.

It is an arithmetic number, because the mean of its divisors is an integer number (5529062680203).

Almost surely, 2^{22111222010021} is an apocalyptic number.

It is an amenable number.

22111222010021 is a deficient number, since it is larger than the sum of its proper divisors (5028710791).

22111222010021 is an equidigital number, since it uses as much as digits as its factorization.

22111222010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5028710790.

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

Adding to 22111222010021 its reverse (12001022211122), we get a palindrome (34112244221143).

The spelling of 22111222010021 in words is "twenty-two trillion, one hundred eleven billion, two hundred twenty-two million, ten thousand, twenty-one".