1221245432 has 16 divisors (see below), whose sum is σ = 2498002200. Its totient is φ = 555111520.

The previous prime is 1221245429. The next prime is 1221245447. The reversal of 1221245432 is 2345421221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6938807 + ... + 6938982.

Almost surely, 2^1221245432 is an apocalyptic number.

It is an amenable number.

1221245432 is an abundant number, since it is smaller than the sum of its proper divisors (1276756768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221245432 is a wasteful number, since it uses less digits than its factorization.

1221245432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13877806 (or 13877802 counting only the distinct ones).

The product of its digits is 3840, while the sum is 26.

The square root of 1221245432 is about 34946.3221526958. The cubic root of 1221245432 is about 1068.8932078906.

Adding to 1221245432 its reverse (2345421221), we get a palindrome (3566666653).

The spelling of 1221245432 in words is "one billion, two hundred twenty-one million, two hundred forty-five thousand, four hundred thirty-two".