21031113332031 has 8 divisors (see below), whose sum is σ = 30590710301184. Its totient is φ = 12746129292120.

The previous prime is 21031113332027. The next prime is 21031113332063. The reversal of 21031113332031 is 13023331113012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21031113332031 - 2² = 21031113332027 is a prime.

It is a super-2 number, since 2×21031113332031² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21031113331992 and 21031113332010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031113332011) 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, 318653232271 + ... + 318653232336.

It is an arithmetic number, because the mean of its divisors is an integer number (3823838787648).

Almost surely, 2^{21031113332031} is an apocalyptic number.

21031113332031 is a deficient number, since it is larger than the sum of its proper divisors (9559596969153).

21031113332031 is a wasteful number, since it uses less digits than its factorization.

21031113332031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637306464621.

The product of its (nonzero) digits is 972, while the sum is 24.

Adding to 21031113332031 its reverse (13023331113012), we get a palindrome (34054444445043).

The spelling of 21031113332031 in words is "twenty-one trillion, thirty-one billion, one hundred thirteen million, three hundred thirty-two thousand, thirty-one".