16051375421 has 2 divisors, whose sum is σ = 16051375422. Its totient is φ = 16051375420.

The previous prime is 16051375381. The next prime is 16051375423. The reversal of 16051375421 is 12457315061.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15354679396 + 696696025 = 123914^2 + 26395^2 .

It is an emirp because it is prime and its reverse (12457315061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16051375421 - 2¹⁰ = 16051374397 is a prime.

It is a super-3 number, since 3×16051375421³ (a number of 32 digits) contains 333 as substring.

Together with 16051375423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16051375423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8025687710 + 8025687711.

It is an arithmetic number, because the mean of its divisors is an integer number (8025687711).

Almost surely, 2^16051375421 is an apocalyptic number.

It is an amenable number.

16051375421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16051375421 is an equidigital number, since it uses as much as digits as its factorization.

16051375421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 35.

The spelling of 16051375421 in words is "sixteen billion, fifty-one million, three hundred seventy-five thousand, four hundred twenty-one".