21013040207 has 2 divisors, whose sum is σ = 21013040208. Its totient is φ = 21013040206.

The previous prime is 21013040201. The next prime is 21013040287. The reversal of 21013040207 is 70204031012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21013040207 - 2¹⁸ = 21012778063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21013040201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506520103 + 10506520104.

It is an arithmetic number, because the mean of its divisors is an integer number (10506520104).

Almost surely, 2^21013040207 is an apocalyptic number.

21013040207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21013040207 is an equidigital number, since it uses as much as digits as its factorization.

21013040207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 20.

Adding to 21013040207 its reverse (70204031012), we get a palindrome (91217071219).

The spelling of 21013040207 in words is "twenty-one billion, thirteen million, forty thousand, two hundred seven".