1221433440045 has 96 divisors (see below), whose sum is σ = 2560765508352. Its totient is φ = 485099237376.

The previous prime is 1221433439987. The next prime is 1221433440047. The reversal of 1221433440045 is 5400443341221.

It is not a de Polignac number, because 1221433440045 - 2¹³ = 1221433431853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221433439988 and 1221433440015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221433440047) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1722822 + ... + 2326151.

It is an arithmetic number, because the mean of its divisors is an integer number (26674640712).

Almost surely, 2^{1221433440045} is an apocalyptic number.

1221433440045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1221433440045 is an abundant number, since it is smaller than the sum of its proper divisors (1339332068307).

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

1221433440045 is a wasteful number, since it uses less digits than its factorization.

1221433440045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4049031 (or 4049018 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 33.

Adding to 1221433440045 its reverse (5400443341221), we get a palindrome (6621876781266).

The spelling of 1221433440045 in words is "one trillion, two hundred twenty-one billion, four hundred thirty-three million, four hundred forty thousand, forty-five".