16427980921 has 8 divisors (see below), whose sum is σ = 17922370464. Its totient is φ = 14933747520.

The previous prime is 16427980879. The next prime is 16427980927. The reversal of 16427980921 is 12908972461.

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 16427980921 - 2¹⁵ = 16427948153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16427980927) 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, 346945 + ... + 391441.

It is an arithmetic number, because the mean of its divisors is an integer number (2240296308).

Almost surely, 2^16427980921 is an apocalyptic number.

16427980921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16427980921 is a deficient number, since it is larger than the sum of its proper divisors (1494389543).

16427980921 is a wasteful number, since it uses less digits than its factorization.

16427980921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78071.

The product of its (nonzero) digits is 435456, while the sum is 49.

The spelling of 16427980921 in words is "sixteen billion, four hundred twenty-seven million, nine hundred eighty thousand, nine hundred twenty-one".