221224021401 has 4 divisors (see below), whose sum is σ = 294965361872. Its totient is φ = 147482680932.

The previous prime is 221224021387. The next prime is 221224021453. The reversal of 221224021401 is 104120422122.

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 221224021401 - 2⁹ = 221224020889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221224021471) 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, 36870670231 + ... + 36870670236.

It is an arithmetic number, because the mean of its divisors is an integer number (73741340468).

Almost surely, 2^221224021401 is an apocalyptic number.

It is an amenable number.

221224021401 is a deficient number, since it is larger than the sum of its proper divisors (73741340471).

221224021401 is an equidigital number, since it uses as much as digits as its factorization.

221224021401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73741340470.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 221224021401 its reverse (104120422122), we get a palindrome (325344443523).

The spelling of 221224021401 in words is "two hundred twenty-one billion, two hundred twenty-four million, twenty-one thousand, four hundred one".