1221432445 has 8 divisors (see below), whose sum is σ = 1487595744. Its totient is φ = 962561424.

The previous prime is 1221432437. The next prime is 1221432451. The reversal of 1221432445 is 5442341221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221432445 - 2³ = 1221432437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1822699 + ... + 1823368.

It is an arithmetic number, because the mean of its divisors is an integer number (185949468).

Almost surely, 2^1221432445 is an apocalyptic number.

It is an amenable number.

1221432445 is a deficient number, since it is larger than the sum of its proper divisors (266163299).

1221432445 is an equidigital number, since it uses as much as digits as its factorization.

1221432445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3646139.

The product of its digits is 7680, while the sum is 28.

The square root of 1221432445 is about 34948.9977681764. The cubic root of 1221432445 is about 1068.9477660538.

Adding to 1221432445 its reverse (5442341221), we get a palindrome (6663773666).

The spelling of 1221432445 in words is "one billion, two hundred twenty-one million, four hundred thirty-two thousand, four hundred forty-five".