21023210267 has 2 divisors, whose sum is σ = 21023210268. Its totient is φ = 21023210266.

The previous prime is 21023210239. The next prime is 21023210287. The reversal of 21023210267 is 76201232012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21023210267 - 2⁸ = 21023210011 is a prime.

It is a super-2 number, since 2×21023210267² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21023210287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511605133 + 10511605134.

It is an arithmetic number, because the mean of its divisors is an integer number (10511605134).

Almost surely, 2^21023210267 is an apocalyptic number.

21023210267 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023210267 is an equidigital number, since it uses as much as digits as its factorization.

21023210267 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

Adding to 21023210267 its reverse (76201232012), we get a palindrome (97224442279).

The spelling of 21023210267 in words is "twenty-one billion, twenty-three million, two hundred ten thousand, two hundred sixty-seven".