1221402412323 has 24 divisors (see below), whose sum is σ = 1779473453472. Its totient is φ = 807267783168.

The previous prime is 1221402412229. The next prime is 1221402412403. The reversal of 1221402412323 is 3232142041221.

1221402412323 is a `hidden beast` number, since 1 + 2 + 21 + 402 + 4 + 1 + 232 + 3 = 666.

It is not a de Polignac number, because 1221402412323 - 2¹² = 1221402408227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221402412723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 561511 + ... + 1660752.

It is an arithmetic number, because the mean of its divisors is an integer number (74144727228).

Almost surely, 2^{1221402412323} is an apocalyptic number.

1221402412323 is a deficient number, since it is larger than the sum of its proper divisors (558071041149).

1221402412323 is a wasteful number, since it uses less digits than its factorization.

1221402412323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2222795 (or 2222792 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 1221402412323 its reverse (3232142041221), we get a palindrome (4453544453544).

The spelling of 1221402412323 in words is "one trillion, two hundred twenty-one billion, four hundred two million, four hundred twelve thousand, three hundred twenty-three".