21008844707 has 2 divisors, whose sum is σ = 21008844708. Its totient is φ = 21008844706.

The previous prime is 21008844653. The next prime is 21008844737. The reversal of 21008844707 is 70744880012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21008844707 - 2⁶ = 21008844643 is a prime.

It is not a weakly prime, because it can be changed into another prime (21008844737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10504422353 + 10504422354.

It is an arithmetic number, because the mean of its divisors is an integer number (10504422354).

Almost surely, 2^21008844707 is an apocalyptic number.

21008844707 is a deficient number, since it is larger than the sum of its proper divisors (1).

21008844707 is an equidigital number, since it uses as much as digits as its factorization.

21008844707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100352, while the sum is 41.

The spelling of 21008844707 in words is "twenty-one billion, eight million, eight hundred forty-four thousand, seven hundred seven".