221112100021 has 8 divisors (see below), whose sum is σ = 224269462784. Its totient is φ = 217958208480.

The previous prime is 221112100007. The next prime is 221112100037. The reversal of 221112100021 is 120001211122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221112100021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221112099974 and 221112100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221112100051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 739365 + ... + 994426.

It is an arithmetic number, because the mean of its divisors is an integer number (28033682848).

Almost surely, 2^221112100021 is an apocalyptic number.

It is an amenable number.

221112100021 is a deficient number, since it is larger than the sum of its proper divisors (3157362763).

221112100021 is a wasteful number, since it uses less digits than its factorization.

221112100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1735611.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221112100021 its reverse (120001211122), we get a palindrome (341113311143).

The spelling of 221112100021 in words is "two hundred twenty-one billion, one hundred twelve million, one hundred thousand, twenty-one".