22011121021 has 8 divisors (see below), whose sum is σ = 22085935704. Its totient is φ = 21936340800.

The previous prime is 22011121001. The next prime is 22011121043. The reversal of 22011121021 is 12012111022.

It can be written as a sum of positive squares in 4 ways, for example, as 7012220121 + 14998900900 = 83739^2 + 122470^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22011121021 - 2¹¹ = 22011118973 is a prime.

It is a super-2 number, since 2×22011121021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22011120992 and 22011121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22011121001) 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 7 ways as a sum of consecutive naturals, for example, 2218171 + ... + 2228071.

It is an arithmetic number, because the mean of its divisors is an integer number (2760741963).

Almost surely, 2^22011121021 is an apocalyptic number.

It is an amenable number.

22011121021 is a deficient number, since it is larger than the sum of its proper divisors (74814683).

22011121021 is an equidigital number, since it uses as much as digits as its factorization.

22011121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17231.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 22011121021 its reverse (12012111022), we get a palindrome (34023232043).

Subtracting from 22011121021 its reverse (12012111022), we obtain a palindrome (9999009999).

The spelling of 22011121021 in words is "twenty-two billion, eleven million, one hundred twenty-one thousand, twenty-one".