21012033307 has 2 divisors, whose sum is σ = 21012033308. Its totient is φ = 21012033306.

The previous prime is 21012033283. The next prime is 21012033311. The reversal of 21012033307 is 70333021012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21012033307 - 2⁷ = 21012033179 is a prime.

It is not a weakly prime, because it can be changed into another prime (21012033347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506016653 + 10506016654.

It is an arithmetic number, because the mean of its divisors is an integer number (10506016654).

Almost surely, 2^21012033307 is an apocalyptic number.

21012033307 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012033307 is an equidigital number, since it uses as much as digits as its factorization.

21012033307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 22.

Adding to 21012033307 its reverse (70333021012), we get a palindrome (91345054319).

The spelling of 21012033307 in words is "twenty-one billion, twelve million, thirty-three thousand, three hundred seven".