1221432404343 has 16 divisors (see below), whose sum is σ = 1637784518400. Its totient is φ = 809684890560.

The previous prime is 1221432404341. The next prime is 1221432404369. The reversal of 1221432404343 is 3434042341221.

It is not a de Polignac number, because 1221432404343 - 2¹ = 1221432404341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221432404341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8931723 + ... + 9067443.

It is an arithmetic number, because the mean of its divisors is an integer number (102361532400).

Almost surely, 2^{1221432404343} is an apocalyptic number.

1221432404343 is a deficient number, since it is larger than the sum of its proper divisors (416352114057).

1221432404343 is a wasteful number, since it uses less digits than its factorization.

1221432404343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152662.

The product of its (nonzero) digits is 55296, while the sum is 33.

Adding to 1221432404343 its reverse (3434042341221), we get a palindrome (4655474745564).

The spelling of 1221432404343 in words is "one trillion, two hundred twenty-one billion, four hundred thirty-two million, four hundred four thousand, three hundred forty-three".