21201211102007 has 2 divisors, whose sum is σ = 21201211102008. Its totient is φ = 21201211102006.

The previous prime is 21201211102003. The next prime is 21201211102067. The reversal of 21201211102007 is 70020111210212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21201211102007 - 2² = 21201211102003 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21201211102007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201211102003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600605551003 + 10600605551004.

It is an arithmetic number, because the mean of its divisors is an integer number (10600605551004).

Almost surely, 2^{21201211102007} is an apocalyptic number.

21201211102007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201211102007 is an equidigital number, since it uses as much as digits as its factorization.

21201211102007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 21201211102007 its reverse (70020111210212), we get a palindrome (91221322312219).

The spelling of 21201211102007 in words is "twenty-one trillion, two hundred one billion, two hundred eleven million, one hundred two thousand, seven".