21112221022011 has 24 divisors (see below), whose sum is σ = 34857916535520. Its totient is φ = 12062050718976.

The previous prime is 21112221022003. The next prime is 21112221022037. The reversal of 21112221022011 is 11022012221112.

21112221022011 is a `hidden beast` number, since 211 + 1 + 2 + 221 + 0 + 220 + 11 = 666.

It is not a de Polignac number, because 21112221022011 - 2³ = 21112221022003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112221022051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28458366 + ... + 29190803.

It is an arithmetic number, because the mean of its divisors is an integer number (1452413188980).

Almost surely, 2^{21112221022011} is an apocalyptic number.

21112221022011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21112221022011 is a deficient number, since it is larger than the sum of its proper divisors (13745695513509).

21112221022011 is a wasteful number, since it uses less digits than its factorization.

21112221022011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57654995 (or 57654992 counting only the distinct ones).

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

Adding to 21112221022011 its reverse (11022012221112), we get a palindrome (32134233243123).

The spelling of 21112221022011 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-one million, twenty-two thousand, eleven".