21301221320231 has 4 divisors (see below), whose sum is σ = 21303343177200. Its totient is φ = 21299099463264.

The previous prime is 21301221320227. The next prime is 21301221320257. The reversal of 21301221320231 is 13202312210312.

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 21301221320231 - 2² = 21301221320227 is a prime.

It is a super-2 number, since 2×21301221320231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21301221320197 and 21301221320206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301221329231) 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, 1060913426 + ... + 1060933503.

It is an arithmetic number, because the mean of its divisors is an integer number (5325835794300).

Almost surely, 2^{21301221320231} is an apocalyptic number.

21301221320231 is a deficient number, since it is larger than the sum of its proper divisors (2121856969).

21301221320231 is a wasteful number, since it uses less digits than its factorization.

21301221320231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121856968.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21301221320231 its reverse (13202312210312), we get a palindrome (34503533530543).

The spelling of 21301221320231 in words is "twenty-one trillion, three hundred one billion, two hundred twenty-one million, three hundred twenty thousand, two hundred thirty-one".