21033330031 has 4 divisors (see below), whose sum is σ = 24038091472. Its totient is φ = 18028568592.

The previous prime is 21033330013. The next prime is 21033330041. The reversal of 21033330031 is 13003333012.

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 21033330031 - 2¹³ = 21033321839 is a prime.

It is a super-2 number, since 2×21033330031² (a number of 21 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 = 21033329990 and 21033330008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033330041) 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, 1502380710 + ... + 1502380723.

It is an arithmetic number, because the mean of its divisors is an integer number (6009522868).

Almost surely, 2^21033330031 is an apocalyptic number.

21033330031 is a deficient number, since it is larger than the sum of its proper divisors (3004761441).

21033330031 is an equidigital number, since it uses as much as digits as its factorization.

21033330031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3004761440.

The product of its (nonzero) digits is 486, while the sum is 19.

Adding to 21033330031 its reverse (13003333012), we get a palindrome (34036663043).

The spelling of 21033330031 in words is "twenty-one billion, thirty-three million, three hundred thirty thousand, thirty-one".