1225404121 has 4 divisors (see below), whose sum is σ = 1225477072. Its totient is φ = 1225331172.

The previous prime is 1225404119. The next prime is 1225404127. The reversal of 1225404121 is 1214045221.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1225404121 - 2¹ = 1225404119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1225404092 and 1225404101.

It is not an unprimeable number, because it can be changed into a prime (1225404127) 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, 2866 + ... + 49588.

It is an arithmetic number, because the mean of its divisors is an integer number (306369268).

Almost surely, 2^1225404121 is an apocalyptic number.

It is an amenable number.

1225404121 is a deficient number, since it is larger than the sum of its proper divisors (72951).

1225404121 is an equidigital number, since it uses as much as digits as its factorization.

1225404121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72950.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 1225404121 is about 35005.7726810879. The cubic root of 1225404121 is about 1070.1051286930.

Adding to 1225404121 its reverse (1214045221), we get a palindrome (2439449342).

The spelling of 1225404121 in words is "one billion, two hundred twenty-five million, four hundred four thousand, one hundred twenty-one".