221112010021 has 4 divisors (see below), whose sum is σ = 252699440032. Its totient is φ = 189524580012.

The previous prime is 221112009983. The next prime is 221112010039. The reversal of 221112010021 is 120010211122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221112010021 - 2⁷ = 221112009893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221112009983 and 221112010010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221112010051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15793714995 + ... + 15793715008.

It is an arithmetic number, because the mean of its divisors is an integer number (63174860008).

Almost surely, 2^221112010021 is an apocalyptic number.

It is an amenable number.

221112010021 is a deficient number, since it is larger than the sum of its proper divisors (31587430011).

221112010021 is an equidigital number, since it uses as much as digits as its factorization.

221112010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31587430010.

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

Adding to 221112010021 its reverse (120010211122), we get a palindrome (341122221143).

The spelling of 221112010021 in words is "two hundred twenty-one billion, one hundred twelve million, ten thousand, twenty-one".