21011201310231 has 12 divisors (see below), whose sum is σ = 33108559640520. Its totient is φ = 12734061400080.

The previous prime is 21011201310191. The next prime is 21011201310251. The reversal of 21011201310231 is 13201310211012.

21011201310231 is a `hidden beast` number, since 2 + 1 + 0 + 1 + 120 + 1 + 310 + 231 = 666.

It is not a de Polignac number, because 21011201310231 - 2⁶ = 21011201310167 is a prime.

It is a super-2 number, since 2×21011201310231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011201310251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106117178236 + ... + 106117178433.

It is an arithmetic number, because the mean of its divisors is an integer number (2759046636710).

Almost surely, 2^{21011201310231} is an apocalyptic number.

21011201310231 is a deficient number, since it is larger than the sum of its proper divisors (12097358330289).

21011201310231 is a wasteful number, since it uses less digits than its factorization.

21011201310231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212234356686 (or 212234356683 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21011201310231 its reverse (13201310211012), we get a palindrome (34212511521243).

The spelling of 21011201310231 in words is "twenty-one trillion, eleven billion, two hundred one million, three hundred ten thousand, two hundred thirty-one".