21444134207 has 2 divisors, whose sum is σ = 21444134208. Its totient is φ = 21444134206.

The previous prime is 21444134177. The next prime is 21444134269. The reversal of 21444134207 is 70243144412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21444134207 - 2¹⁶ = 21444068671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21444134287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10722067103 + 10722067104.

It is an arithmetic number, because the mean of its divisors is an integer number (10722067104).

Almost surely, 2^21444134207 is an apocalyptic number.

21444134207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21444134207 is an equidigital number, since it uses as much as digits as its factorization.

21444134207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 32.

Adding to 21444134207 its reverse (70243144412), we get a palindrome (91687278619).

The spelling of 21444134207 in words is "twenty-one billion, four hundred forty-four million, one hundred thirty-four thousand, two hundred seven".