21322203012221 has 4 divisors (see below), whose sum is σ = 22576450248252. Its totient is φ = 20067955776192.

The previous prime is 21322203012197. The next prime is 21322203012223. The reversal of 21322203012221 is 12221030222312.

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 10284784860100 + 11037418152121 = 3206990^2 + 3322261^2 .

It is a cyclic number.

It is not a de Polignac number, because 21322203012221 - 2⁴² = 16924156501117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322203012223) 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, 627123617990 + ... + 627123618023.

It is an arithmetic number, because the mean of its divisors is an integer number (5644112562063).

Almost surely, 2^{21322203012221} is an apocalyptic number.

It is an amenable number.

21322203012221 is a deficient number, since it is larger than the sum of its proper divisors (1254247236031).

21322203012221 is a wasteful number, since it uses less digits than its factorization.

21322203012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1254247236030.

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

Adding to 21322203012221 its reverse (12221030222312), we get a palindrome (33543233234533).

The spelling of 21322203012221 in words is "twenty-one trillion, three hundred twenty-two billion, two hundred three million, twelve thousand, two hundred twenty-one".