221302022021321 has 4 divisors (see below), whose sum is σ = 222917365247892. Its totient is φ = 219686678794752.

The previous prime is 221302022021317. The next prime is 221302022021341. The reversal of 221302022021321 is 123120220203122.

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 42700474393600 + 178601547627721 = 6534560^2 + 13364189^2 .

It is a cyclic number.

It is not a de Polignac number, because 221302022021321 - 2² = 221302022021317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221302022021341) 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, 807671613080 + ... + 807671613353.

It is an arithmetic number, because the mean of its divisors is an integer number (55729341311973).

Almost surely, 2^{221302022021321} is an apocalyptic number.

It is an amenable number.

221302022021321 is a deficient number, since it is larger than the sum of its proper divisors (1615343226571).

221302022021321 is a wasteful number, since it uses less digits than its factorization.

221302022021321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1615343226570.

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

Adding to 221302022021321 its reverse (123120220203122), we get a palindrome (344422242224443).

The spelling of 221302022021321 in words is "two hundred twenty-one trillion, three hundred two billion, twenty-two million, twenty-one thousand, three hundred twenty-one".