1221131020456 has 16 divisors (see below), whose sum is σ = 2290304795040. Its totient is φ = 610383075120.

The previous prime is 1221131020451. The next prime is 1221131020457. The reversal of 1221131020456 is 6540201311221.

It is not an unprimeable number, because it can be changed into a prime (1221131020451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22775940 + ... + 22829491.

It is an arithmetic number, because the mean of its divisors is an integer number (143144049690).

Almost surely, 2^{1221131020456} is an apocalyptic number.

It is an amenable number.

1221131020456 is a deficient number, since it is larger than the sum of its proper divisors (1069173774584).

1221131020456 is a wasteful number, since it uses less digits than its factorization.

1221131020456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45608784 (or 45608780 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

Adding to 1221131020456 its reverse (6540201311221), we get a palindrome (7761332331677).

The spelling of 1221131020456 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-one million, twenty thousand, four hundred fifty-six".