221302231311 has 16 divisors (see below), whose sum is σ = 344397394944. Its totient is φ = 123767812704.

The previous prime is 221302231307. The next prime is 221302231357. The reversal of 221302231311 is 113132203122.

It is not a de Polignac number, because 221302231311 - 2² = 221302231307 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221302231361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112107540 + ... + 112109513.

It is an arithmetic number, because the mean of its divisors is an integer number (21524837184).

Almost surely, 2^221302231311 is an apocalyptic number.

221302231311 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

221302231311 is a deficient number, since it is larger than the sum of its proper divisors (123095163633).

221302231311 is a wasteful number, since it uses less digits than its factorization.

221302231311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224217110.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 221302231311 its reverse (113132203122), we get a palindrome (334434434433).

The spelling of 221302231311 in words is "two hundred twenty-one billion, three hundred two million, two hundred thirty-one thousand, three hundred eleven".