21002121310207 has 2 divisors, whose sum is σ = 21002121310208. Its totient is φ = 21002121310206.

The previous prime is 21002121310193. The next prime is 21002121310241. The reversal of 21002121310207 is 70201312120012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21002121310207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002121310277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501060655103 + 10501060655104.

It is an arithmetic number, because the mean of its divisors is an integer number (10501060655104).

Almost surely, 2^{21002121310207} is an apocalyptic number.

21002121310207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002121310207 is an equidigital number, since it uses as much as digits as its factorization.

21002121310207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 22.

Adding to 21002121310207 its reverse (70201312120012), we get a palindrome (91203433430219).

The spelling of 21002121310207 in words is "twenty-one trillion, two billion, one hundred twenty-one million, three hundred ten thousand, two hundred seven".