21000311107 has 2 divisors, whose sum is σ = 21000311108. Its totient is φ = 21000311106.

The previous prime is 21000311083. The next prime is 21000311159. The reversal of 21000311107 is 70111300012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21000311107 - 2²³ = 20991922499 is a prime.

It is not a weakly prime, because it can be changed into another prime (21000311197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500155553 + 10500155554.

It is an arithmetic number, because the mean of its divisors is an integer number (10500155554).

Almost surely, 2^21000311107 is an apocalyptic number.

21000311107 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000311107 is an equidigital number, since it uses as much as digits as its factorization.

21000311107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42, while the sum is 16.

Adding to 21000311107 its reverse (70111300012), we get a palindrome (91111611119).

The spelling of 21000311107 in words is "twenty-one billion, three hundred eleven thousand, one hundred seven".