221421413 has 8 divisors (see below), whose sum is σ = 236639232. Its totient is φ = 206447296.

The previous prime is 221421377. The next prime is 221421419. The reversal of 221421413 is 314124122.

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 221421413 - 2⁸ = 221421157 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 (221421419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59045 + ... + 62682.

It is an arithmetic number, because the mean of its divisors is an integer number (29579904).

Almost surely, 2^221421413 is an apocalyptic number.

It is an amenable number.

221421413 is a deficient number, since it is larger than the sum of its proper divisors (15217819).

221421413 is a wasteful number, since it uses less digits than its factorization.

221421413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121851.

The product of its digits is 384, while the sum is 20.

The square root of 221421413 is about 14880.2356500158. The cubic root of 221421413 is about 604.9784050758.

Adding to 221421413 its reverse (314124122), we get a palindrome (535545535).

The spelling of 221421413 in words is "two hundred twenty-one million, four hundred twenty-one thousand, four hundred thirteen".