1225320432221 has 4 divisors (see below), whose sum is σ = 1246088575200. Its totient is φ = 1204552289244.

The previous prime is 1225320432209. The next prime is 1225320432227. The reversal of 1225320432221 is 1222340235221.

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 1225320432221 - 2²² = 1225316237917 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 (1225320432227) 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, 10384071401 + ... + 10384071518.

It is an arithmetic number, because the mean of its divisors is an integer number (311522143800).

Almost surely, 2^{1225320432221} is an apocalyptic number.

It is an amenable number.

1225320432221 is a deficient number, since it is larger than the sum of its proper divisors (20768142979).

1225320432221 is an equidigital number, since it uses as much as digits as its factorization.

1225320432221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20768142978.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 1225320432221 its reverse (1222340235221), we get a palindrome (2447660667442).

The spelling of 1225320432221 in words is "one trillion, two hundred twenty-five billion, three hundred twenty million, four hundred thirty-two thousand, two hundred twenty-one".