16721850371 has 2 divisors, whose sum is σ = 16721850372. Its totient is φ = 16721850370.

The previous prime is 16721850367. The next prime is 16721850373. The reversal of 16721850371 is 17305812761.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (17305812761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16721850371 - 2² = 16721850367 is a prime.

It is a super-2 number, since 2×16721850371² (a number of 21 digits) contains 22 as substring.

Together with 16721850373, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16721850373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8360925185 + 8360925186.

It is an arithmetic number, because the mean of its divisors is an integer number (8360925186).

Almost surely, 2^16721850371 is an apocalyptic number.

16721850371 is a deficient number, since it is larger than the sum of its proper divisors (1).

16721850371 is an equidigital number, since it uses as much as digits as its factorization.

16721850371 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 41.

The spelling of 16721850371 in words is "sixteen billion, seven hundred twenty-one million, eight hundred fifty thousand, three hundred seventy-one".