21034210321031 has 4 divisors (see below), whose sum is σ = 21043044515064. Its totient is φ = 21025376127000.

The previous prime is 21034210321021. The next prime is 21034210321039. The reversal of 21034210321031 is 13012301243012.

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 21034210321031 - 2⁶ = 21034210320967 is a prime.

It is a super-2 number, since 2×21034210321031² (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 = 21034210320988 and 21034210321006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034210321039) 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, 4417093445 + ... + 4417098206.

It is an arithmetic number, because the mean of its divisors is an integer number (5260761128766).

Almost surely, 2^{21034210321031} is an apocalyptic number.

21034210321031 is a deficient number, since it is larger than the sum of its proper divisors (8834194033).

21034210321031 is an equidigital number, since it uses as much as digits as its factorization.

21034210321031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8834194032.

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

Adding to 21034210321031 its reverse (13012301243012), we get a palindrome (34046511564043).

The spelling of 21034210321031 in words is "twenty-one trillion, thirty-four billion, two hundred ten million, three hundred twenty-one thousand, thirty-one".