22001111000021 has 4 divisors (see below), whose sum is σ = 22001150196972. Its totient is φ = 22001071803072.

The previous prime is 22001110999993. The next prime is 22001111000027. The reversal of 22001111000021 is 12000011110022.

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 5181154726225 + 16819956273796 = 2276215^2 + 4101214^2 .

It is a cyclic number.

It is not a de Polignac number, because 22001111000021 - 2³⁸ = 21726233093077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22001110999966 and 22001111000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001111000027) 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, 18744116 + ... + 19883261.

It is an arithmetic number, because the mean of its divisors is an integer number (5500287549243).

Almost surely, 2^{22001111000021} is an apocalyptic number.

It is an amenable number.

22001111000021 is a deficient number, since it is larger than the sum of its proper divisors (39196951).

22001111000021 is an equidigital number, since it uses as much as digits as its factorization.

22001111000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39196950.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 22001111000021 its reverse (12000011110022), we get a palindrome (34001122110043).

The spelling of 22001111000021 in words is "twenty-two trillion, one billion, one hundred eleven million, twenty-one", and thus it is an aban number.