21116670206707 has 2 divisors, whose sum is σ = 21116670206708. Its totient is φ = 21116670206706.

The previous prime is 21116670206699. The next prime is 21116670206717. The reversal of 21116670206707 is 70760207661112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21116670206707 - 2³ = 21116670206699 is a prime.

It is not a weakly prime, because it can be changed into another prime (21116670206717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10558335103353 + 10558335103354.

It is an arithmetic number, because the mean of its divisors is an integer number (10558335103354).

Almost surely, 2^{21116670206707} is an apocalyptic number.

21116670206707 is a deficient number, since it is larger than the sum of its proper divisors (1).

21116670206707 is an equidigital number, since it uses as much as digits as its factorization.

21116670206707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 296352, while the sum is 46.

Adding to 21116670206707 its reverse (70760207661112), we get a palindrome (91876877867819).

The spelling of 21116670206707 in words is "twenty-one trillion, one hundred sixteen billion, six hundred seventy million, two hundred six thousand, seven hundred seven".