12950519921 has 4 divisors (see below), whose sum is σ = 12950945700. Its totient is φ = 12950094144.

The previous prime is 12950519903. The next prime is 12950519927. The reversal of 12950519921 is 12991505921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2116000000 + 10834519921 = 46000^2 + 104089^2 .

It is a cyclic number.

It is not a de Polignac number, because 12950519921 - 2³⁰ = 11876778097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12950519927) 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, 163436 + ... + 229373.

It is an arithmetic number, because the mean of its divisors is an integer number (3237736425).

Almost surely, 2^12950519921 is an apocalyptic number.

It is an amenable number.

12950519921 is a deficient number, since it is larger than the sum of its proper divisors (425779).

12950519921 is an equidigital number, since it uses as much as digits as its factorization.

12950519921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425778.

The product of its (nonzero) digits is 72900, while the sum is 44.

The spelling of 12950519921 in words is "twelve billion, nine hundred fifty million, five hundred nineteen thousand, nine hundred twenty-one".