1221632790403 has 4 divisors (see below), whose sum is σ = 1225949514328. Its totient is φ = 1217316066480.

The previous prime is 1221632790401. The next prime is 1221632790419. The reversal of 1221632790403 is 3040972361221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221632790403 - 2¹ = 1221632790401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221632790401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2158361538 + ... + 2158362103.

It is an arithmetic number, because the mean of its divisors is an integer number (306487378582).

Almost surely, 2^{1221632790403} is an apocalyptic number.

1221632790403 is a deficient number, since it is larger than the sum of its proper divisors (4316723925).

1221632790403 is an equidigital number, since it uses as much as digits as its factorization.

1221632790403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4316723924.

The product of its (nonzero) digits is 108864, while the sum is 40.

The spelling of 1221632790403 in words is "one trillion, two hundred twenty-one billion, six hundred thirty-two million, seven hundred ninety thousand, four hundred three".