21110101222221 has 32 divisors (see below), whose sum is σ = 34195051545600. Its totient is φ = 12764857152240.

The previous prime is 21110101222213. The next prime is 21110101222237. The reversal of 21110101222221 is 12222210101112.

21110101222221 is a `hidden beast` number, since 211 + 1 + 0 + 10 + 1 + 222 + 221 = 666.

It is not a de Polignac number, because 21110101222221 - 2³ = 21110101222213 is a prime.

It is a super-2 number, since 2×21110101222221² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21110101222194 and 21110101222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110101222241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80823811 + ... + 81084576.

It is an arithmetic number, because the mean of its divisors is an integer number (1068595360800).

Almost surely, 2^{21110101222221} is an apocalyptic number.

It is an amenable number.

21110101222221 is a deficient number, since it is larger than the sum of its proper divisors (13084950323379).

21110101222221 is a wasteful number, since it uses less digits than its factorization.

21110101222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161908846 (or 161908840 counting only the distinct ones).

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

Adding to 21110101222221 its reverse (12222210101112), we get a palindrome (33332311323333).

The spelling of 21110101222221 in words is "twenty-one trillion, one hundred ten billion, one hundred one million, two hundred twenty-two thousand, two hundred twenty-one".