21010302331 has 2 divisors, whose sum is σ = 21010302332. Its totient is φ = 21010302330.

The previous prime is 21010302311. The next prime is 21010302337. The reversal of 21010302331 is 13320301012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21010302331 is a prime.

It is a super-2 number, since 2×21010302331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21010302337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505151165 + 10505151166.

It is an arithmetic number, because the mean of its divisors is an integer number (10505151166).

Almost surely, 2^21010302331 is an apocalyptic number.

21010302331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010302331 is an equidigital number, since it uses as much as digits as its factorization.

21010302331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21010302331 its reverse (13320301012), we get a palindrome (34330603343).

The spelling of 21010302331 in words is "twenty-one billion, ten million, three hundred two thousand, three hundred thirty-one".