21221220211007 has 2 divisors, whose sum is σ = 21221220211008. Its totient is φ = 21221220211006.

The previous prime is 21221220211001. The next prime is 21221220211151. The reversal of 21221220211007 is 70011202212212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221220211007 - 2⁴ = 21221220210991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221220211001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610610105503 + 10610610105504.

It is an arithmetic number, because the mean of its divisors is an integer number (10610610105504).

Almost surely, 2^{21221220211007} is an apocalyptic number.

21221220211007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221220211007 is an equidigital number, since it uses as much as digits as its factorization.

21221220211007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 23.

Adding to 21221220211007 its reverse (70011202212212), we get a palindrome (91232422423219).

The spelling of 21221220211007 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty million, two hundred eleven thousand, seven".