1221400432 has 40 divisors (see below), whose sum is σ = 2707255296. Its totient is φ = 522929856.

The previous prime is 1221400417. The next prime is 1221400457. The reversal of 1221400432 is 2340041221.

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, 118593 + ... + 128479.

Almost surely, 2^1221400432 is an apocalyptic number.

It is an amenable number.

1221400432 is an abundant number, since it is smaller than the sum of its proper divisors (1485854864).

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

1221400432 is a wasteful number, since it uses less digits than its factorization.

1221400432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11005 (or 10999 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1221400432 is about 34948.5397692092. The cubic root of 1221400432 is about 1068.9384271490.

Adding to 1221400432 its reverse (2340041221), we get a palindrome (3561441653).

The spelling of 1221400432 in words is "one billion, two hundred twenty-one million, four hundred thousand, four hundred thirty-two".