21001202222211 has 12 divisors (see below), whose sum is σ = 30335113252288. Its totient is φ = 14000781461904.

The previous prime is 21001202222207. The next prime is 21001202222219. The reversal of 21001202222211 is 11222220210012.

It is a happy number.

21001202222211 is a `hidden beast` number, since 2 + 100 + 120 + 222 + 221 + 1 = 666.

It is not a de Polignac number, because 21001202222211 - 2² = 21001202222207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001202222219) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7809501 + ... + 10148433.

Almost surely, 2^{21001202222211} is an apocalyptic number.

21001202222211 is a deficient number, since it is larger than the sum of its proper divisors (9333911030077).

21001202222211 is a wasteful number, since it uses less digits than its factorization.

21001202222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3336602 (or 3336599 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21001202222211 its reverse (11222220210012), we get a palindrome (32223422432223).

The spelling of 21001202222211 in words is "twenty-one trillion, one billion, two hundred two million, two hundred twenty-two thousand, two hundred eleven".