16510600121 has 4 divisors (see below), whose sum is σ = 16822120932. Its totient is φ = 16199079312.

The previous prime is 16510600097. The next prime is 16510600147. The reversal of 16510600121 is 12100601561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12100601561 = 53 ⋅228313237.

It can be written as a sum of positive squares in 2 ways, for example, as 10253790121 + 6256810000 = 101261^2 + 79100^2 .

It is a cyclic number.

It is not a de Polignac number, because 16510600121 - 2¹⁴ = 16510583737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16510200121) 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, 155760326 + ... + 155760431.

It is an arithmetic number, because the mean of its divisors is an integer number (4205530233).

Almost surely, 2^16510600121 is an apocalyptic number.

It is an amenable number.

16510600121 is a deficient number, since it is larger than the sum of its proper divisors (311520811).

16510600121 is an equidigital number, since it uses as much as digits as its factorization.

16510600121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311520810.

The product of its (nonzero) digits is 360, while the sum is 23.

The spelling of 16510600121 in words is "sixteen billion, five hundred ten million, six hundred thousand, one hundred twenty-one".