21213121300207 has 2 divisors, whose sum is σ = 21213121300208. Its totient is φ = 21213121300206.

The previous prime is 21213121300193. The next prime is 21213121300213. The reversal of 21213121300207 is 70200312131212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21213121300207 - 2⁷ = 21213121300079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21213121300237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606560650103 + 10606560650104.

It is an arithmetic number, because the mean of its divisors is an integer number (10606560650104).

Almost surely, 2^{21213121300207} is an apocalyptic number.

21213121300207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213121300207 is an equidigital number, since it uses as much as digits as its factorization.

21213121300207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

Adding to 21213121300207 its reverse (70200312131212), we get a palindrome (91413433431419).

The spelling of 21213121300207 in words is "twenty-one trillion, two hundred thirteen billion, one hundred twenty-one million, three hundred thousand, two hundred seven".