1225280825221 has 4 divisors (see below), whose sum is σ = 1225364976352. Its totient is φ = 1225196674092.

The previous prime is 1225280825213. The next prime is 1225280825227.

1225280825221 is nontrivially palindromic in base 10.

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 1225280825221 - 2³ = 1225280825213 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 (1225280825227) 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, 42053721 + ... + 42082846.

It is an arithmetic number, because the mean of its divisors is an integer number (306341244088).

Almost surely, 2^{1225280825221} is an apocalyptic number.

It is an amenable number.

1225280825221 is a deficient number, since it is larger than the sum of its proper divisors (84151131).

1225280825221 is an equidigital number, since it uses as much as digits as its factorization.

1225280825221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84151130.

The product of its (nonzero) digits is 102400, while the sum is 40.

The spelling of 1225280825221 in words is "one trillion, two hundred twenty-five billion, two hundred eighty million, eight hundred twenty-five thousand, two hundred twenty-one".