6421364451 has 16 divisors (see below), whose sum is σ = 9734369920. Its totient is φ = 4181352840.

The previous prime is 6421364449. The next prime is 6421364461. The reversal of 6421364451 is 1544631246.

6421364451 is a `hidden beast` number, since 6 + 4 + 2 + 1 + 3 + 644 + 5 + 1 = 666.

It is not a de Polignac number, because 6421364451 - 2¹ = 6421364449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6421364441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2764285 + ... + 2766606.

It is an arithmetic number, because the mean of its divisors is an integer number (608398120).

Almost surely, 2^6421364451 is an apocalyptic number.

6421364451 is a deficient number, since it is larger than the sum of its proper divisors (3313005469).

6421364451 is a wasteful number, since it uses less digits than its factorization.

6421364451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5530943 (or 5530937 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 6421364451 is about 80133.4165688697. The cubic root of 6421364451 is about 1858.6991763062.

Adding to 6421364451 its reverse (1544631246), we get a palindrome (7965995697).

The spelling of 6421364451 in words is "six billion, four hundred twenty-one million, three hundred sixty-four thousand, four hundred fifty-one".