221323031311 has 4 divisors (see below), whose sum is σ = 221485650624. Its totient is φ = 221160412000.

The previous prime is 221323031291. The next prime is 221323031317. The reversal of 221323031311 is 113130323122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221323031311 - 2³⁷ = 83884077839 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 (221323031317) 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, 81307615 + ... + 81310336.

It is an arithmetic number, because the mean of its divisors is an integer number (55371412656).

Almost surely, 2^221323031311 is an apocalyptic number.

221323031311 is a deficient number, since it is larger than the sum of its proper divisors (162619313).

221323031311 is a wasteful number, since it uses less digits than its factorization.

221323031311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162619312.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 221323031311 its reverse (113130323122), we get a palindrome (334453354433).

The spelling of 221323031311 in words is "two hundred twenty-one billion, three hundred twenty-three million, thirty-one thousand, three hundred eleven".