221621341 has 4 divisors (see below), whose sum is σ = 223089184. Its totient is φ = 220153500.

The previous prime is 221621293. The next prime is 221621437. The reversal of 221621341 is 143126122.

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 221621341 - 2¹³ = 221613149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221721341) 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, 733695 + ... + 733996.

It is an arithmetic number, because the mean of its divisors is an integer number (55772296).

Almost surely, 2^221621341 is an apocalyptic number.

It is an amenable number.

221621341 is a deficient number, since it is larger than the sum of its proper divisors (1467843).

221621341 is a wasteful number, since it uses less digits than its factorization.

221621341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1467842.

The product of its digits is 576, while the sum is 22.

The square root of 221621341 is about 14886.9520386142. The cubic root of 221621341 is about 605.1604346507.

Adding to 221621341 its reverse (143126122), we get a palindrome (364747463).

The spelling of 221621341 in words is "two hundred twenty-one million, six hundred twenty-one thousand, three hundred forty-one".