21221022011211 has 16 divisors (see below), whose sum is σ = 34296601230720. Its totient is φ = 12861225461160.

The previous prime is 21221022011209. The next prime is 21221022011221. The reversal of 21221022011211 is 11211022012212.

21221022011211 is a `hidden beast` number, since 2 + 1 + 221 + 0 + 220 + 11 + 211 = 666.

It is not a de Polignac number, because 21221022011211 - 2¹ = 21221022011209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221022011221) 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, 35725625985 + ... + 35725626578.

It is an arithmetic number, because the mean of its divisors is an integer number (2143537576920).

Almost surely, 2^{21221022011211} is an apocalyptic number.

21221022011211 is a deficient number, since it is larger than the sum of its proper divisors (13075579219509).

21221022011211 is a wasteful number, since it uses less digits than its factorization.

21221022011211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71451252583 (or 71451252577 counting only the distinct ones).

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

Adding to 21221022011211 its reverse (11211022012212), we get a palindrome (32432044023423).

The spelling of 21221022011211 in words is "twenty-one trillion, two hundred twenty-one billion, twenty-two million, eleven thousand, two hundred eleven".