1623002209921 has 4 divisors (see below), whose sum is σ = 1623168357700. Its totient is φ = 1622836062144.

The previous prime is 1623002209861. The next prime is 1623002209937. The reversal of 1623002209921 is 1299022003261.

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

It can be written as a sum of positive squares in 2 ways, for example, as 340310056321 + 1282692153600 = 583361^2 + 1132560^2 .

It is a cyclic number.

It is not a de Polignac number, because 1623002209921 - 2¹¹ = 1623002207873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1623002209951) 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, 83059236 + ... + 83078773.

It is an arithmetic number, because the mean of its divisors is an integer number (405792089425).

Almost surely, 2^{1623002209921} is an apocalyptic number.

It is an amenable number.

1623002209921 is a deficient number, since it is larger than the sum of its proper divisors (166147779).

1623002209921 is an equidigital number, since it uses as much as digits as its factorization.

1623002209921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166147778.

The product of its (nonzero) digits is 23328, while the sum is 37.

The spelling of 1623002209921 in words is "one trillion, six hundred twenty-three billion, two million, two hundred nine thousand, nine hundred twenty-one".