21121021201207 has 2 divisors, whose sum is σ = 21121021201208. Its totient is φ = 21121021201206.

The previous prime is 21121021201177. The next prime is 21121021201321. The reversal of 21121021201207 is 70210212012112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21121021201207 - 2⁷ = 21121021201079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121021207207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560510600603 + 10560510600604.

It is an arithmetic number, because the mean of its divisors is an integer number (10560510600604).

Almost surely, 2^{21121021201207} is an apocalyptic number.

21121021201207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121021201207 is an equidigital number, since it uses as much as digits as its factorization.

21121021201207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 22.

Adding to 21121021201207 its reverse (70210212012112), we get a palindrome (91331233213319).

The spelling of 21121021201207 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-one million, two hundred one thousand, two hundred seven".