22121303400221 has 4 divisors (see below), whose sum is σ = 22369857371100. Its totient is φ = 21872749429344.

The previous prime is 22121303400187. The next prime is 22121303400233. The reversal of 22121303400221 is 12200430312122.

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 10702385102500 + 11418918297721 = 3271450^2 + 3379189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22121303400221 is a prime.

It is a super-2 number, since 2×22121303400221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121303430221) 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 3 ways as a sum of consecutive naturals, for example, 124276985306 + ... + 124276985483.

It is an arithmetic number, because the mean of its divisors is an integer number (5592464342775).

Almost surely, 2^{22121303400221} is an apocalyptic number.

It is an amenable number.

22121303400221 is a deficient number, since it is larger than the sum of its proper divisors (248553970879).

22121303400221 is an equidigital number, since it uses as much as digits as its factorization.

22121303400221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248553970878.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 22121303400221 its reverse (12200430312122), we get a palindrome (34321733712343).

The spelling of 22121303400221 in words is "twenty-two trillion, one hundred twenty-one billion, three hundred three million, four hundred thousand, two hundred twenty-one".