22111210001021 has 4 divisors (see below), whose sum is σ = 22113637412700. Its totient is φ = 22108782589344.

The previous prime is 22111210001017. The next prime is 22111210001057. The reversal of 22111210001021 is 12010001211122.

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 1731303324100 + 20379906676921 = 1315790^2 + 4514411^2 .

It is a cyclic number.

It is not a de Polignac number, because 22111210001021 - 2² = 22111210001017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22111210000987 and 22111210001005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22111210001071) 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, 1213692176 + ... + 1213710393.

It is an arithmetic number, because the mean of its divisors is an integer number (5528409353175).

Almost surely, 2^{22111210001021} is an apocalyptic number.

It is an amenable number.

22111210001021 is a deficient number, since it is larger than the sum of its proper divisors (2427411679).

22111210001021 is an equidigital number, since it uses as much as digits as its factorization.

22111210001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2427411678.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 22111210001021 its reverse (12010001211122), we get a palindrome (34121211212143).

The spelling of 22111210001021 in words is "twenty-two trillion, one hundred eleven billion, two hundred ten million, one thousand, twenty-one".