1221425456 has 10 divisors (see below), whose sum is σ = 2366511852. Its totient is φ = 610712720.

The previous prime is 1221425423. The next prime is 1221425459. The reversal of 1221425456 is 6545241221.

It is not an unprimeable number, because it can be changed into a prime (1221425459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38169530 + ... + 38169561.

Almost surely, 2^1221425456 is an apocalyptic number.

1221425456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1221425456 is a deficient number, since it is larger than the sum of its proper divisors (1145086396).

1221425456 is an equidigital number, since it uses as much as digits as its factorization.

1221425456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76339099 (or 76339093 counting only the distinct ones).

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

The square root of 1221425456 is about 34948.8977794722. The cubic root of 1221425456 is about 1068.9457272208.

Adding to 1221425456 its reverse (6545241221), we get a palindrome (7766666677).

The spelling of 1221425456 in words is "one billion, two hundred twenty-one million, four hundred twenty-five thousand, four hundred fifty-six".