13261021545 has 16 divisors (see below), whose sum is σ = 21949277760. Its totient is φ = 6828663744.

The previous prime is 13261021541. The next prime is 13261021619. The reversal of 13261021545 is 54512016231.

It is not a de Polignac number, because 13261021545 - 2² = 13261021541 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13261021541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15242119 + ... + 15242988.

It is an arithmetic number, because the mean of its divisors is an integer number (1371829860).

Almost surely, 2^13261021545 is an apocalyptic number.

13261021545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13261021545 is a deficient number, since it is larger than the sum of its proper divisors (8688256215).

13261021545 is a wasteful number, since it uses less digits than its factorization.

13261021545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30485144.

The product of its (nonzero) digits is 7200, while the sum is 30.

Adding to 13261021545 its reverse (54512016231), we get a palindrome (67773037776).

The spelling of 13261021545 in words is "thirteen billion, two hundred sixty-one million, twenty-one thousand, five hundred forty-five".