221013021 has 8 divisors (see below), whose sum is σ = 300244320. Its totient is φ = 144561872.

The previous prime is 221013019. The next prime is 221013029. The reversal of 221013021 is 120310122.

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

It is a cyclic number.

It is not a de Polignac number, because 221013021 - 2¹ = 221013019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221012988 and 221013006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221013029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 694851 + ... + 695168.

It is an arithmetic number, because the mean of its divisors is an integer number (37530540).

Almost surely, 2^221013021 is an apocalyptic number.

It is an amenable number.

221013021 is a deficient number, since it is larger than the sum of its proper divisors (79231299).

221013021 is a wasteful number, since it uses less digits than its factorization.

221013021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1390075.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 221013021 is about 14866.5066844905. The cubic root of 221013021 is about 604.6062333095.

Adding to 221013021 its reverse (120310122), we get a palindrome (341323143).

The spelling of 221013021 in words is "two hundred twenty-one million, thirteen thousand, twenty-one".