221004413 has 4 divisors (see below), whose sum is σ = 252576480. Its totient is φ = 189432348.

The previous prime is 221004359. The next prime is 221004419. The reversal of 221004413 is 314400122.

221004413 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 314400122 = 2 ⋅157200061.

It is not a de Polignac number, because 221004413 - 2¹⁴ = 220988029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221004391 and 221004400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221004419) 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, 15786023 + ... + 15786036.

It is an arithmetic number, because the mean of its divisors is an integer number (63144120).

Almost surely, 2^221004413 is an apocalyptic number.

It is an amenable number.

221004413 is a deficient number, since it is larger than the sum of its proper divisors (31572067).

221004413 is an equidigital number, since it uses as much as digits as its factorization.

221004413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31572066.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 221004413 is about 14866.2171718296. The cubic root of 221004413 is about 604.5983838202.

Adding to 221004413 its reverse (314400122), we get a palindrome (535404535).

The spelling of 221004413 in words is "two hundred twenty-one million, four thousand, four hundred thirteen".