1221005540432 has 20 divisors (see below), whose sum is σ = 2365826402196. Its totient is φ = 610469694720.

The previous prime is 1221005540393. The next prime is 1221005540449. The reversal of 1221005540432 is 2340455001221.

It can be written as a sum of positive squares in 2 ways, for example, as 964276864576 + 256728675856 = 981976^2 + 506684^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1221005540395 and 1221005540404.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1761293 + ... + 2354604.

Almost surely, 2^{1221005540432} is an apocalyptic number.

It is an amenable number.

1221005540432 is a deficient number, since it is larger than the sum of its proper divisors (1144820861764).

1221005540432 is a wasteful number, since it uses less digits than its factorization.

1221005540432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4134446 (or 4134440 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The spelling of 1221005540432 in words is "one trillion, two hundred twenty-one billion, five million, five hundred forty thousand, four hundred thirty-two".