221102112210021 has 96 divisors (see below), whose sum is σ = 375177120864000. Its totient is φ = 122824976901120.

The previous prime is 221102112210019. The next prime is 221102112210103. The reversal of 221102112210021 is 120012211201122.

221102112210021 is a `hidden beast` number, since 2 + 211 + 0 + 211 + 221 + 0 + 0 + 21 = 666.

It is not a de Polignac number, because 221102112210021 - 2¹ = 221102112210019 is a prime.

It is a super-2 number, since 2×221102112210021² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221102112209976 and 221102112210003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221102112210011) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15626688255 + ... + 15626702403.

It is an arithmetic number, because the mean of its divisors is an integer number (3908095009000).

Almost surely, 2^{221102112210021} is an apocalyptic number.

221102112210021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221102112210021 is a deficient number, since it is larger than the sum of its proper divisors (154075008653979).

221102112210021 is a wasteful number, since it uses less digits than its factorization.

221102112210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19419 (or 19416 counting only the distinct ones).

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

Adding to 221102112210021 its reverse (120012211201122), we get a palindrome (341114323411143).

The spelling of 221102112210021 in words is "two hundred twenty-one trillion, one hundred two billion, one hundred twelve million, two hundred ten thousand, twenty-one".