1221543532203 has 64 divisors (see below), whose sum is σ = 1713051648000. Its totient is φ = 773624307456.

The previous prime is 1221543532189. The next prime is 1221543532247. The reversal of 1221543532203 is 3022353451221.

It is not a de Polignac number, because 1221543532203 - 2⁸ = 1221543531947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221543532603) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 256678338 + ... + 256683096.

It is an arithmetic number, because the mean of its divisors is an integer number (26766432000).

Almost surely, 2^{1221543532203} is an apocalyptic number.

1221543532203 is a deficient number, since it is larger than the sum of its proper divisors (491508115797).

1221543532203 is a wasteful number, since it uses less digits than its factorization.

1221543532203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5256.

The product of its (nonzero) digits is 43200, while the sum is 33.

Adding to 1221543532203 its reverse (3022353451221), we get a palindrome (4243896983424).

The spelling of 1221543532203 in words is "one trillion, two hundred twenty-one billion, five hundred forty-three million, five hundred thirty-two thousand, two hundred three".