12621061540 has 24 divisors (see below), whose sum is σ = 26506646712. Its totient is φ = 5047964160.

The previous prime is 12621061507. The next prime is 12621061547. The reversal of 12621061540 is 4516012621.

It can be written as a sum of positive squares in 4 ways, for example, as 649638144 + 11971423396 = 25488^2 + 109414^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12621061499 and 12621061508.

It is not an unprimeable number, because it can be changed into a prime (12621061547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273330 + ... + 316150.

It is an arithmetic number, because the mean of its divisors is an integer number (1104443613).

Almost surely, 2^12621061540 is an apocalyptic number.

12621061540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12621061540 is an abundant number, since it is smaller than the sum of its proper divisors (13885585172).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12621061540 is a wasteful number, since it uses less digits than its factorization.

12621061540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57567 (or 57565 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The spelling of 12621061540 in words is "twelve billion, six hundred twenty-one million, sixty-one thousand, five hundred forty".