221340413 has 4 divisors (see below), whose sum is σ = 252960480. Its totient is φ = 189720348.

The previous prime is 221340409. The next prime is 221340439. The reversal of 221340413 is 314043122.

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 221340413 - 2² = 221340409 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 (221345413) 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, 15810023 + ... + 15810036.

It is an arithmetic number, because the mean of its divisors is an integer number (63240120).

Almost surely, 2^221340413 is an apocalyptic number.

It is an amenable number.

221340413 is a deficient number, since it is larger than the sum of its proper divisors (31620067).

221340413 is an equidigital number, since it uses as much as digits as its factorization.

221340413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31620066.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 221340413 is about 14877.5136699652. The cubic root of 221340413 is about 604.9046253590.

Adding to 221340413 its reverse (314043122), we get a palindrome (535383535).

The spelling of 221340413 in words is "two hundred twenty-one million, three hundred forty thousand, four hundred thirteen".