4021344321021 has 6 divisors (see below), whose sum is σ = 5808608463710. Its totient is φ = 2680896214008.

The previous prime is 4021344320999. The next prime is 4021344321047. The reversal of 4021344321021 is 1201234431204.

4021344321021 is a `hidden beast` number, since 4 + 0 + 2 + 1 + 3 + 443 + 210 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2695884867225 + 1325459453796 = 1641915^2 + 1151286^2 .

It is not a de Polignac number, because 4021344321021 - 2¹⁹ = 4021343796733 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 (4021344321121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 223408017826 + ... + 223408017843.

Almost surely, 2^{4021344321021} is an apocalyptic number.

It is an amenable number.

4021344321021 is a deficient number, since it is larger than the sum of its proper divisors (1787264142689).

4021344321021 is a wasteful number, since it uses less digits than its factorization.

4021344321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446816035675 (or 446816035672 counting only the distinct ones).

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

Adding to 4021344321021 its reverse (1201234431204), we get a palindrome (5222578752225).

The spelling of 4021344321021 in words is "four trillion, twenty-one billion, three hundred forty-four million, three hundred twenty-one thousand, twenty-one".