21002212112011 has 32 divisors (see below), whose sum is σ = 24776389330560. Its totient is φ = 17615402563584.

The previous prime is 21002212111987. The next prime is 21002212112029. The reversal of 21002212112011 is 11021121220012.

It is a cyclic number.

It is not a de Polignac number, because 21002212112011 - 2¹⁹ = 21002211587723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002212112051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69405906 + ... + 69707848.

It is an arithmetic number, because the mean of its divisors is an integer number (774262166580).

Almost surely, 2^{21002212112011} is an apocalyptic number.

21002212112011 is a deficient number, since it is larger than the sum of its proper divisors (3774177218549).

21002212112011 is a wasteful number, since it uses less digits than its factorization.

21002212112011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312855.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21002212112011 its reverse (11021121220012), we get a palindrome (32023333332023).

The spelling of 21002212112011 in words is "twenty-one trillion, two billion, two hundred twelve million, one hundred twelve thousand, eleven".