16421208731 has 8 divisors (see below), whose sum is σ = 17458480800. Its totient is φ = 15410878912.

The previous prime is 16421208721. The next prime is 16421208743. The reversal of 16421208731 is 13780212461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16421208731 - 2¹⁸ = 16420946587 is a prime.

It is a super-2 number, since 2×16421208731² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16421208691 and 16421208700.

It is not an unprimeable number, because it can be changed into a prime (16421208721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6734306 + ... + 6736743.

It is an arithmetic number, because the mean of its divisors is an integer number (2182310100).

Almost surely, 2^16421208731 is an apocalyptic number.

16421208731 is a deficient number, since it is larger than the sum of its proper divisors (1037272069).

16421208731 is a wasteful number, since it uses less digits than its factorization.

16421208731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13471125.

The product of its (nonzero) digits is 16128, while the sum is 35.

The spelling of 16421208731 in words is "sixteen billion, four hundred twenty-one million, two hundred eight thousand, seven hundred thirty-one".