221223314021 has 4 divisors (see below), whose sum is σ = 221475564972. Its totient is φ = 220971063072.

The previous prime is 221223314003. The next prime is 221223314033. The reversal of 221223314021 is 120413322122.

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 92955472996 + 128267841025 = 304886^2 + 358145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221223314021 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 (221223314051) 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, 126124160 + ... + 126125913.

It is an arithmetic number, because the mean of its divisors is an integer number (55368891243).

Almost surely, 2^221223314021 is an apocalyptic number.

It is an amenable number.

221223314021 is a deficient number, since it is larger than the sum of its proper divisors (252250951).

221223314021 is an equidigital number, since it uses as much as digits as its factorization.

221223314021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252250950.

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

Adding to 221223314021 its reverse (120413322122), we get a palindrome (341636636143).

The spelling of 221223314021 in words is "two hundred twenty-one billion, two hundred twenty-three million, three hundred fourteen thousand, twenty-one".