13521491280 has 480 divisors, whose sum is σ = 54276168960. Its totient is φ = 2977873920.

The previous prime is 13521491261. The next prime is 13521491287. The reversal of 13521491280 is 8219412531.

13521491280 is a `hidden beast` number, since 1 + 3 + 521 + 4 + 9 + 128 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13521491287) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3902829 + ... + 3906291.

It is an arithmetic number, because the mean of its divisors is an integer number (113075352).

Almost surely, 2^13521491280 is an apocalyptic number.

13521491280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13521491280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27138084480).

13521491280 is an abundant number, since it is smaller than the sum of its proper divisors (40754677680).

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

13521491280 is a wasteful number, since it uses less digits than its factorization.

13521491280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3539 (or 3530 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 13521491280 in words is "thirteen billion, five hundred twenty-one million, four hundred ninety-one thousand, two hundred eighty".