6944558021 has 4 divisors (see below), whose sum is σ = 7353061452. Its totient is φ = 6536054592.

The previous prime is 6944557999. The next prime is 6944558039. The reversal of 6944558021 is 1208554496.

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 4197225796 + 2747332225 = 64786^2 + 52415^2 .

It is a cyclic number.

It is not a de Polignac number, because 6944558021 - 2¹⁸ = 6944295877 is a prime.

It is a super-2 number, since 2×6944558021² = 96453772214070872882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6944558221) 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, 204251690 + ... + 204251723.

It is an arithmetic number, because the mean of its divisors is an integer number (1838265363).

Almost surely, 2^6944558021 is an apocalyptic number.

It is an amenable number.

6944558021 is a deficient number, since it is larger than the sum of its proper divisors (408503431).

6944558021 is a wasteful number, since it uses less digits than its factorization.

6944558021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408503430.

The product of its (nonzero) digits is 345600, while the sum is 44.

The square root of 6944558021 is about 83334.0147898804. The cubic root of 6944558021 is about 1907.8674718816.

The spelling of 6944558021 in words is "six billion, nine hundred forty-four million, five hundred fifty-eight thousand, twenty-one".