221314550421 has 4 divisors (see below), whose sum is σ = 295086067232. Its totient is φ = 147543033612.

The previous prime is 221314550399. The next prime is 221314550441. The reversal of 221314550421 is 124055413122.

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 not a de Polignac number, because 221314550421 - 2⁹ = 221314549909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221314550441) 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, 36885758401 + ... + 36885758406.

It is an arithmetic number, because the mean of its divisors is an integer number (73771516808).

Almost surely, 2^221314550421 is an apocalyptic number.

It is an amenable number.

221314550421 is a deficient number, since it is larger than the sum of its proper divisors (73771516811).

221314550421 is an equidigital number, since it uses as much as digits as its factorization.

221314550421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73771516810.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 221314550421 its reverse (124055413122), we get a palindrome (345369963543).

The spelling of 221314550421 in words is "two hundred twenty-one billion, three hundred fourteen million, five hundred fifty thousand, four hundred twenty-one".