6444260060021 has 6 divisors (see below), whose sum is σ = 7496384151510. Its totient is φ = 5523651479976.

The previous prime is 6444260060003. The next prime is 6444260060039. The reversal of 6444260060021 is 1200600624446.

It is an interprime number because it is at equal distance from previous prime (6444260060003) and next prime (6444260060039).

It can be written as a sum of positive squares in only one way, i.e., 6027736971025 + 416523088996 = 2455145^2 + 645386^2 .

It is not a de Polignac number, because 6444260060021 - 2¹⁰ = 6444260058997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6444260065021) 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, 65757755666 + ... + 65757755763.

It is an arithmetic number, because the mean of its divisors is an integer number (1249397358585).

Almost surely, 2^{6444260060021} is an apocalyptic number.

It is an amenable number.

6444260060021 is a deficient number, since it is larger than the sum of its proper divisors (1052124091489).

6444260060021 is a wasteful number, since it uses less digits than its factorization.

6444260060021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131515511443 (or 131515511436 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 35.

Adding to 6444260060021 its reverse (1200600624446), we get a palindrome (7644860684467).

The spelling of 6444260060021 in words is "six trillion, four hundred forty-four billion, two hundred sixty million, sixty thousand, twenty-one".