21214638307 has 2 divisors, whose sum is σ = 21214638308. Its totient is φ = 21214638306.

The previous prime is 21214638253. The next prime is 21214638329. The reversal of 21214638307 is 70383641212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21214638307 - 2¹⁵ = 21214605539 is a prime.

It is not a weakly prime, because it can be changed into another prime (21224638307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10607319153 + 10607319154.

It is an arithmetic number, because the mean of its divisors is an integer number (10607319154).

Almost surely, 2^21214638307 is an apocalyptic number.

21214638307 is a deficient number, since it is larger than the sum of its proper divisors (1).

21214638307 is an equidigital number, since it uses as much as digits as its factorization.

21214638307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 37.

The spelling of 21214638307 in words is "twenty-one billion, two hundred fourteen million, six hundred thirty-eight thousand, three hundred seven".