21002222011211 has 6 divisors (see below), whose sum is σ = 24431156217180. Its totient is φ = 18001904580996.

The previous prime is 21002222011159. The next prime is 21002222011273. The reversal of 21002222011211 is 11211022220012.

It is a de Polignac number, because none of the positive numbers 2^k-21002222011211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21002222011211.

It is not an unprimeable number, because it can be changed into a prime (21002222011411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214308387821 + ... + 214308387918.

It is an arithmetic number, because the mean of its divisors is an integer number (4071859369530).

Almost surely, 2^{21002222011211} is an apocalyptic number.

21002222011211 is a deficient number, since it is larger than the sum of its proper divisors (3428934205969).

21002222011211 is an equidigital number, since it uses as much as digits as its factorization.

21002222011211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428616775753 (or 428616775746 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21002222011211 its reverse (11211022220012), we get a palindrome (32213244231223).

The spelling of 21002222011211 in words is "twenty-one trillion, two billion, two hundred twenty-two million, eleven thousand, two hundred eleven".