1221477425 has 12 divisors (see below), whose sum is σ = 1731008256. Its totient is φ = 837584400.

The previous prime is 1221477409. The next prime is 1221477431. The reversal of 1221477425 is 5247741221.

It is not a de Polignac number, because 1221477425 - 2⁴ = 1221477409 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3489761 + ... + 3490110.

It is an arithmetic number, because the mean of its divisors is an integer number (144250688).

Almost surely, 2^1221477425 is an apocalyptic number.

It is an amenable number.

1221477425 is a deficient number, since it is larger than the sum of its proper divisors (509530831).

1221477425 is an equidigital number, since it uses as much as digits as its factorization.

1221477425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6979888 (or 6979883 counting only the distinct ones).

The product of its digits is 31360, while the sum is 35.

The square root of 1221477425 is about 34949.6412714065. The cubic root of 1221477425 is about 1068.9608874454.

The spelling of 1221477425 in words is "one billion, two hundred twenty-one million, four hundred seventy-seven thousand, four hundred twenty-five".