1621463321323 has 4 divisors (see below), whose sum is σ = 1621474424208. Its totient is φ = 1621452218440.

The previous prime is 1621463321321. The next prime is 1621463321327. The reversal of 1621463321323 is 3231233641261.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1621463321323 - 2¹ = 1621463321321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1621463321321) 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, 5329423 + ... + 5625448.

It is an arithmetic number, because the mean of its divisors is an integer number (405368606052).

Almost surely, 2^{1621463321323} is an apocalyptic number.

1621463321323 is a deficient number, since it is larger than the sum of its proper divisors (11102885).

1621463321323 is a wasteful number, since it uses less digits than its factorization.

1621463321323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11102884.

The product of its digits is 93312, while the sum is 37.

Adding to 1621463321323 its reverse (3231233641261), we get a palindrome (4852696962584).

The spelling of 1621463321323 in words is "one trillion, six hundred twenty-one billion, four hundred sixty-three million, three hundred twenty-one thousand, three hundred twenty-three".