16272571421 has 4 divisors (see below), whose sum is σ = 16273220832. Its totient is φ = 16271922012.

The previous prime is 16272571373. The next prime is 16272571433. The reversal of 16272571421 is 12417527261.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16272571421 - 2²² = 16268377117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16272570421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285545 + ... + 337758.

It is an arithmetic number, because the mean of its divisors is an integer number (4068305208).

Almost surely, 2^16272571421 is an apocalyptic number.

It is an amenable number.

16272571421 is a deficient number, since it is larger than the sum of its proper divisors (649411).

16272571421 is an equidigital number, since it uses as much as digits as its factorization.

16272571421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649410.

The product of its digits is 47040, while the sum is 38.

The spelling of 16272571421 in words is "sixteen billion, two hundred seventy-two million, five hundred seventy-one thousand, four hundred twenty-one".