16421457011 has 4 divisors (see below), whose sum is σ = 16422165432. Its totient is φ = 16420748592.

The previous prime is 16421457001. The next prime is 16421457067. The reversal of 16421457011 is 11075412461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16421457011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16421457001) 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 3 ways as a sum of consecutive naturals, for example, 318221 + ... + 366206.

It is an arithmetic number, because the mean of its divisors is an integer number (4105541358).

Almost surely, 2^16421457011 is an apocalyptic number.

16421457011 is a deficient number, since it is larger than the sum of its proper divisors (708421).

16421457011 is an equidigital number, since it uses as much as digits as its factorization.

16421457011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708420.

The product of its (nonzero) digits is 6720, while the sum is 32.

Adding to 16421457011 its reverse (11075412461), we get a palindrome (27496869472).

The spelling of 16421457011 in words is "sixteen billion, four hundred twenty-one million, four hundred fifty-seven thousand, eleven".