21302311121 has 16 divisors (see below), whose sum is σ = 26587507968. Its totient is φ = 16617182400.

The previous prime is 21302311109. The next prime is 21302311127. The reversal of 21302311121 is 12111320312.

It is a de Polignac number, because none of the positive numbers 2^k-21302311121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21302311121.

It is not an unprimeable number, because it can be changed into a prime (21302311127) 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, 1642070 + ... + 1654991.

It is an arithmetic number, because the mean of its divisors is an integer number (1661719248).

Almost surely, 2^21302311121 is an apocalyptic number.

It is an amenable number.

21302311121 is a deficient number, since it is larger than the sum of its proper divisors (5285196847).

21302311121 is a wasteful number, since it uses less digits than its factorization.

21302311121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3297152.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21302311121 its reverse (12111320312), we get a palindrome (33413631433).

The spelling of 21302311121 in words is "twenty-one billion, three hundred two million, three hundred eleven thousand, one hundred twenty-one".