22001203121 has 12 divisors (see below), whose sum is σ = 23600787444. Its totient is φ = 20501532000.

The previous prime is 22001203117. The next prime is 22001203129. The reversal of 22001203121 is 12130210022.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2868780721 + 19132422400 = 53561^2 + 138320^2 .

It is not a de Polignac number, because 22001203121 - 2² = 22001203117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22001203096 and 22001203105.

It is not an unprimeable number, because it can be changed into a prime (22001203129) 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 11 ways as a sum of consecutive naturals, for example, 477530 + ... + 521571.

It is an arithmetic number, because the mean of its divisors is an integer number (1966732287).

Almost surely, 2^22001203121 is an apocalyptic number.

It is an amenable number.

22001203121 is a deficient number, since it is larger than the sum of its proper divisors (1599584323).

22001203121 is an equidigital number, since it uses as much as digits as its factorization.

22001203121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999200 (or 999181 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 22001203121 its reverse (12130210022), we get a palindrome (34131413143).

The spelling of 22001203121 in words is "twenty-two billion, one million, two hundred three thousand, one hundred twenty-one".