1225421147 has 4 divisors (see below), whose sum is σ = 1233645600. Its totient is φ = 1217196696.

The previous prime is 1225421111. The next prime is 1225421159. The reversal of 1225421147 is 7411245221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1225421147 - 2⁸ = 1225420891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225621147) 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, 4112003 + ... + 4112300.

It is an arithmetic number, because the mean of its divisors is an integer number (308411400).

Almost surely, 2^1225421147 is an apocalyptic number.

1225421147 is a deficient number, since it is larger than the sum of its proper divisors (8224453).

1225421147 is an equidigital number, since it uses as much as digits as its factorization.

1225421147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8224452.

The product of its digits is 4480, while the sum is 29.

The square root of 1225421147 is about 35006.0158687046. The cubic root of 1225421147 is about 1070.1100847520.

Adding to 1225421147 its reverse (7411245221), we get a palindrome (8636666368).

The spelling of 1225421147 in words is "one billion, two hundred twenty-five million, four hundred twenty-one thousand, one hundred forty-seven".