21022011212211 has 12 divisors (see below), whose sum is σ = 30460916355792. Its totient is φ = 13970463811056.

The previous prime is 21022011212207. The next prime is 21022011212239. The reversal of 21022011212211 is 11221211022012.

21022011212211 is a `hidden beast` number, since 2 + 10 + 220 + 11 + 212 + 211 = 666.

It is not a de Polignac number, because 21022011212211 - 2² = 21022011212207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21022011219211) 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, 3684191191 + ... + 3684196896.

It is an arithmetic number, because the mean of its divisors is an integer number (2538409696316).

Almost surely, 2^{21022011212211} is an apocalyptic number.

21022011212211 is a deficient number, since it is larger than the sum of its proper divisors (9438905143581).

21022011212211 is a wasteful number, since it uses less digits than its factorization.

21022011212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7368388410 (or 7368388407 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21022011212211 its reverse (11221211022012), we get a palindrome (32243222234223).

The spelling of 21022011212211 in words is "twenty-one trillion, twenty-two billion, eleven million, two hundred twelve thousand, two hundred eleven".