16721051 has 2 divisors, whose sum is σ = 16721052. Its totient is φ = 16721050.

The previous prime is 16721041. The next prime is 16721057. The reversal of 16721051 is 15012761.

It is a strong prime.

It is an emirp because it is prime and its reverse (15012761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16721051 - 2²² = 12526747 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16721057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8360525 + 8360526.

It is an arithmetic number, because the mean of its divisors is an integer number (8360526).

Almost surely, 2^16721051 is an apocalyptic number.

16721051 is a deficient number, since it is larger than the sum of its proper divisors (1).

16721051 is an equidigital number, since it uses as much as digits as its factorization.

16721051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 16721051 is about 4089.1381732585. The cubic root of 16721051 is about 255.7140106646.

The spelling of 16721051 in words is "sixteen million, seven hundred twenty-one thousand, fifty-one".