21211102102007 has 2 divisors, whose sum is σ = 21211102102008. Its totient is φ = 21211102102006.

The previous prime is 21211102101991. The next prime is 21211102102037. The reversal of 21211102102007 is 70020120111212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21211102102007 - 2⁴ = 21211102101991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21211102102007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211102102037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605551051003 + 10605551051004.

It is an arithmetic number, because the mean of its divisors is an integer number (10605551051004).

Almost surely, 2^{21211102102007} is an apocalyptic number.

21211102102007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211102102007 is an equidigital number, since it uses as much as digits as its factorization.

21211102102007 is an evil number, because the sum of its binary digits is even.

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

Adding to 21211102102007 its reverse (70020120111212), we get a palindrome (91231222213219).

The spelling of 21211102102007 in words is "twenty-one trillion, two hundred eleven billion, one hundred two million, one hundred two thousand, seven".