21002201212211 has 16 divisors (see below), whose sum is σ = 22261318279200. Its totient is φ = 19758726390528.

The previous prime is 21002201212171. The next prime is 21002201212219. The reversal of 21002201212211 is 11221210220012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21002201212211 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 21002201212211.

It is not an unprimeable number, because it can be changed into a prime (21002201212219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 910856 + ... + 6544773.

It is an arithmetic number, because the mean of its divisors is an integer number (1391332392450).

Almost surely, 2^{21002201212211} is an apocalyptic number.

21002201212211 is a deficient number, since it is larger than the sum of its proper divisors (1259117066989).

21002201212211 is a wasteful number, since it uses less digits than its factorization.

21002201212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7456678.

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

Adding to 21002201212211 its reverse (11221210220012), we get a palindrome (32223411432223).

The spelling of 21002201212211 in words is "twenty-one trillion, two billion, two hundred one million, two hundred twelve thousand, two hundred eleven".