21211320112031 has 8 divisors (see below), whose sum is σ = 24736233367200. Its totient is φ = 18181131524304.

The previous prime is 21211320111983. The next prime is 21211320112043. The reversal of 21211320112031 is 13021102311212.

It is not a de Polignac number, because 21211320112031 - 2³⁰ = 21210246370207 is a prime.

It is a super-2 number, since 2×21211320112031² (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 = 21211320111994 and 21211320112012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211320112231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30920291366 + ... + 30920292051.

It is an arithmetic number, because the mean of its divisors is an integer number (3092029170900).

Almost surely, 2^{21211320112031} is an apocalyptic number.

21211320112031 is a deficient number, since it is larger than the sum of its proper divisors (3524913255169).

21211320112031 is an frugal number, since it uses more digits than its factorization.

21211320112031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61840583438 (or 61840583424 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21211320112031 its reverse (13021102311212), we get a palindrome (34232422423243).

The spelling of 21211320112031 in words is "twenty-one trillion, two hundred eleven billion, three hundred twenty million, one hundred twelve thousand, thirty-one".