21031311333031 has 8 divisors (see below), whose sum is σ = 21352567696880. Its totient is φ = 20710951083072.

The previous prime is 21031311332939. The next prime is 21031311333047. The reversal of 21031311333031 is 13033311313012.

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

It is a cyclic number.

It is not a de Polignac number, because 21031311333031 - 2²¹ = 21031309235879 is a prime.

It is a super-2 number, since 2×21031311333031² (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 = 21031311332987 and 21031311333005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031311330031) 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, 223981176 + ... + 224075053.

It is an arithmetic number, because the mean of its divisors is an integer number (2669070962110).

Almost surely, 2^{21031311333031} is an apocalyptic number.

21031311333031 is a deficient number, since it is larger than the sum of its proper divisors (321256363849).

21031311333031 is an equidigital number, since it uses as much as digits as its factorization.

21031311333031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448056945.

The product of its (nonzero) digits is 1458, while the sum is 25.

Adding to 21031311333031 its reverse (13033311313012), we get a palindrome (34064622646043).

The spelling of 21031311333031 in words is "twenty-one trillion, thirty-one billion, three hundred eleven million, three hundred thirty-three thousand, thirty-one".