6344623021 has 12 divisors (see below), whose sum is σ = 7020046432. Its totient is φ = 5729625000.

The previous prime is 6344622931. The next prime is 6344623027. The reversal of 6344623021 is 1203264436.

It is not a de Polignac number, because 6344623021 - 2¹⁷ = 6344491949 is a prime.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6344623027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 155355 + ... + 191896.

Almost surely, 2^6344623021 is an apocalyptic number.

It is an amenable number.

6344623021 is a deficient number, since it is larger than the sum of its proper divisors (675423411).

6344623021 is a wasteful number, since it uses less digits than its factorization.

6344623021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347424 (or 347413 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 6344623021 is about 79653.1419405412. The cubic root of 6344623021 is about 1851.2650729683.

Adding to 6344623021 its reverse (1203264436), we get a palindrome (7547887457).

The spelling of 6344623021 in words is "six billion, three hundred forty-four million, six hundred twenty-three thousand, twenty-one".