4021321039999 has 4 divisors (see below), whose sum is σ = 4021398683064. Its totient is φ = 4021243396936.

The previous prime is 4021321039987. The next prime is 4021321040003. The reversal of 4021321039999 is 9999301231204.

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 4021321039999 - 2²⁷ = 4021186822271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021321039909) 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, 38743792 + ... + 38847445.

It is an arithmetic number, because the mean of its divisors is an integer number (1005349670766).

Almost surely, 2^{4021321039999} is an apocalyptic number.

4021321039999 is a deficient number, since it is larger than the sum of its proper divisors (77643065).

4021321039999 is an equidigital number, since it uses as much as digits as its factorization.

4021321039999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77643064.

The product of its (nonzero) digits is 944784, while the sum is 52.

The spelling of 4021321039999 in words is "four trillion, twenty-one billion, three hundred twenty-one million, thirty-nine thousand, nine hundred ninety-nine".