21022012221111 has 72 divisors (see below), whose sum is σ = 35345166266592. Its totient is φ = 11989369497600.

The previous prime is 21022012221101. The next prime is 21022012221139. The reversal of 21022012221111 is 11112221022012.

21022012221111 is a `hidden beast` number, since 210 + 220 + 1 + 2 + 221 + 1 + 11 = 666.

It is not a de Polignac number, because 21022012221111 - 2⁶ = 21022012221047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022012221101) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 128787430 + ... + 128950556.

It is an arithmetic number, because the mean of its divisors is an integer number (490905087036).

Almost surely, 2^{21022012221111} is an apocalyptic number.

21022012221111 is a deficient number, since it is larger than the sum of its proper divisors (14323154045481).

21022012221111 is a wasteful number, since it uses less digits than its factorization.

21022012221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170133 (or 170119 counting only the distinct ones).

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

Adding to 21022012221111 its reverse (11112221022012), we get a palindrome (32134233243123).

The spelling of 21022012221111 in words is "twenty-one trillion, twenty-two billion, twelve million, two hundred twenty-one thousand, one hundred eleven".