21010221330031 has 4 divisors (see below), whose sum is σ = 21010232596000. Its totient is φ = 21010210064064.

The previous prime is 21010221330023. The next prime is 21010221330041. The reversal of 21010221330031 is 13003312201012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21010221330031 - 2³ = 21010221330023 is a prime.

It is a super-2 number, since 2×21010221330031² (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 = 21010221329990 and 21010221330008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010221330041) 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, 2094786 + ... + 6812383.

It is an arithmetic number, because the mean of its divisors is an integer number (5252558149000).

Almost surely, 2^{21010221330031} is an apocalyptic number.

21010221330031 is a deficient number, since it is larger than the sum of its proper divisors (11265969).

21010221330031 is an equidigital number, since it uses as much as digits as its factorization.

21010221330031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11265968.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21010221330031 its reverse (13003312201012), we get a palindrome (34013533531043).

The spelling of 21010221330031 in words is "twenty-one trillion, ten billion, two hundred twenty-one million, three hundred thirty thousand, thirty-one".