221113021 has 4 divisors (see below), whose sum is σ = 223912000. Its totient is φ = 218314044.

The previous prime is 221112977. The next prime is 221113037. The reversal of 221113021 is 120311122.

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 221113021 - 2¹¹ = 221110973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221112992 and 221113010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221113091) 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, 1399371 + ... + 1399528.

It is an arithmetic number, because the mean of its divisors is an integer number (55978000).

Almost surely, 2^221113021 is an apocalyptic number.

It is an amenable number.

221113021 is a deficient number, since it is larger than the sum of its proper divisors (2798979).

221113021 is an equidigital number, since it uses as much as digits as its factorization.

221113021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2798978.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 221113021 is about 14869.8695690312. The cubic root of 221113021 is about 604.6974066811.

Adding to 221113021 its reverse (120311122), we get a palindrome (341424143).

The spelling of 221113021 in words is "two hundred twenty-one million, one hundred thirteen thousand, twenty-one".