16421399052 has 48 divisors (see below), whose sum is σ = 39410525952. Its totient is φ = 5317963200.

The previous prime is 16421399051. The next prime is 16421399053. The reversal of 16421399052 is 25099312461.

It is an interprime number because it is at equal distance from previous prime (16421399051) and next prime (16421399053).

It is a junction number, because it is equal to n+sod(n) for n = 16421398995 and 16421399013.

It is not an unprimeable number, because it can be changed into a prime (16421399051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 276177 + ... + 330327.

It is an arithmetic number, because the mean of its divisors is an integer number (821052624).

Almost surely, 2^16421399052 is an apocalyptic number.

16421399052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16421399052 is an abundant number, since it is smaller than the sum of its proper divisors (22989126900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16421399052 is a wasteful number, since it uses less digits than its factorization.

16421399052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54878 (or 54876 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 42.

The spelling of 16421399052 in words is "sixteen billion, four hundred twenty-one million, three hundred ninety-nine thousand, fifty-two".