221225305222121 has 4 divisors (see below), whose sum is σ = 221228371947600. Its totient is φ = 221222238496644.

The previous prime is 221225305222081. The next prime is 221225305222153. The reversal of 221225305222121 is 121222503522122.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-221225305222121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221225305222721) 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, 1533254531 + ... + 1533398808.

It is an arithmetic number, because the mean of its divisors is an integer number (55307092986900).

Almost surely, 2^{221225305222121} is an apocalyptic number.

It is an amenable number.

221225305222121 is a deficient number, since it is larger than the sum of its proper divisors (3066725479).

221225305222121 is an equidigital number, since it uses as much as digits as its factorization.

221225305222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3066725478.

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 221225305222121 its reverse (121222503522122), we get a palindrome (342447808744243).

The spelling of 221225305222121 in words is "two hundred twenty-one trillion, two hundred twenty-five billion, three hundred five million, two hundred twenty-two thousand, one hundred twenty-one".