22121001111001 has 4 divisors (see below), whose sum is σ = 23822616581092. Its totient is φ = 20419385640912.

The previous prime is 22121001110981. The next prime is 22121001111043. The reversal of 22121001111001 is 10011110012122.

It is a happy number.

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 10882576265625 + 11238424845376 = 3298875^2 + 3352376^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121001111001 - 2¹⁷ = 22121000979929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 1701615470077 = 22121001111001 / (2 + 2 + 1 + 2 + 1 + 0 + 0 + 1 + 1 + 1 + 1 + 0 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22121001121001) 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, 850807735026 + ... + 850807735051.

It is an arithmetic number, because the mean of its divisors is an integer number (5955654145273).

Almost surely, 2^{22121001111001} is an apocalyptic number.

It is an amenable number.

22121001111001 is a deficient number, since it is larger than the sum of its proper divisors (1701615470091).

22121001111001 is a wasteful number, since it uses less digits than its factorization.

22121001111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701615470090.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 22121001111001 its reverse (10011110012122), we get a palindrome (32132111123123).

The spelling of 22121001111001 in words is "twenty-two trillion, one hundred twenty-one billion, one million, one hundred eleven thousand, one".