22012000221221 has 4 divisors (see below), whose sum is σ = 22015051940652. Its totient is φ = 22008948501792.

The previous prime is 22012000221179. The next prime is 22012000221229. The reversal of 22012000221221 is 12212200021022.

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 20398871613121 + 1613128608100 = 4516511^2 + 1270090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22012000221221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22012000221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22012000221229) 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, 1525848896 + ... + 1525863321.

It is an arithmetic number, because the mean of its divisors is an integer number (5503762985163).

Almost surely, 2^{22012000221221} is an apocalyptic number.

It is an amenable number.

22012000221221 is a deficient number, since it is larger than the sum of its proper divisors (3051719431).

22012000221221 is an equidigital number, since it uses as much as digits as its factorization.

22012000221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3051719430.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22012000221221 its reverse (12212200021022), we get a palindrome (34224200242243).

The spelling of 22012000221221 in words is "twenty-two trillion, twelve billion, two hundred twenty-one thousand, two hundred twenty-one".