5318399421 has 12 divisors (see below), whose sum is σ = 8086455520. Its totient is φ = 3358989000.

The previous prime is 5318399381. The next prime is 5318399423. The reversal of 5318399421 is 1249938135.

It is a happy number.

5318399421 is a `hidden beast` number, since 531 + 8 + 3 + 9 + 94 + 21 = 666.

It is not a de Polignac number, because 5318399421 - 2¹¹ = 5318397373 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 (5318399423) 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, 15550705 + ... + 15551046.

Almost surely, 2^5318399421 is an apocalyptic number.

It is an amenable number.

5318399421 is a deficient number, since it is larger than the sum of its proper divisors (2768056099).

5318399421 is a wasteful number, since it uses less digits than its factorization.

5318399421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31101776 (or 31101773 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 5318399421 is about 72927.3571507977. The cubic root of 5318399421 is about 1745.5286582515.

The spelling of 5318399421 in words is "five billion, three hundred eighteen million, three hundred ninety-nine thousand, four hundred twenty-one".