221222041421 has 4 divisors (see below), whose sum is σ = 230840391072. Its totient is φ = 211603691772.

The previous prime is 221222041361. The next prime is 221222041429. The reversal of 221222041421 is 124140222122.

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 221222041421 - 2¹⁰ = 221222040397 is a prime.

It is a super-2 number, since 2×221222041421² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 9618349627 = 221222041421 / (2 + 2 + 1 + 2 + 2 + 2 + 0 + 4 + 1 + 4 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222041429) 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, 4809174791 + ... + 4809174836.

It is an arithmetic number, because the mean of its divisors is an integer number (57710097768).

Almost surely, 2^221222041421 is an apocalyptic number.

It is an amenable number.

221222041421 is a deficient number, since it is larger than the sum of its proper divisors (9618349651).

221222041421 is an equidigital number, since it uses as much as digits as its factorization.

221222041421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9618349650.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 221222041421 its reverse (124140222122), we get a palindrome (345362263543).

The spelling of 221222041421 in words is "two hundred twenty-one billion, two hundred twenty-two million, forty-one thousand, four hundred twenty-one".