21221122101111 has 12 divisors (see below), whose sum is σ = 31985459399088. Its totient is φ = 13532309745504.

The previous prime is 21221122101107. The next prime is 21221122101239. The reversal of 21221122101111 is 11110122112212.

It is a happy number.

21221122101111 is a `hidden beast` number, since 212 + 211 + 221 + 0 + 11 + 11 = 666.

It is not a de Polignac number, because 21221122101111 - 2² = 21221122101107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221122106111) 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, 51258748830 + ... + 51258749243.

It is an arithmetic number, because the mean of its divisors is an integer number (2665454949924).

Almost surely, 2^{21221122101111} is an apocalyptic number.

21221122101111 is a deficient number, since it is larger than the sum of its proper divisors (10764337297977).

21221122101111 is a wasteful number, since it uses less digits than its factorization.

21221122101111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102517498102 (or 102517498099 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21221122101111 its reverse (11110122112212), we get a palindrome (32331244213323).

The spelling of 21221122101111 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-two million, one hundred one thousand, one hundred eleven".