12721261502 has 4 divisors (see below), whose sum is σ = 19081892256. Its totient is φ = 6360630750.

The previous prime is 12721261499. The next prime is 12721261507. The reversal of 12721261502 is 20516212721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20516212721 = 59 ⋅347732419.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12721261507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3180315374 + ... + 3180315377.

It is an arithmetic number, because the mean of its divisors is an integer number (4770473064).

Almost surely, 2^12721261502 is an apocalyptic number.

12721261502 is a deficient number, since it is larger than the sum of its proper divisors (6360630754).

12721261502 is an equidigital number, since it uses as much as digits as its factorization.

12721261502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6360630753.

The product of its (nonzero) digits is 3360, while the sum is 29.

The spelling of 12721261502 in words is "twelve billion, seven hundred twenty-one million, two hundred sixty-one thousand, five hundred two".