12761521920 has 1152 divisors, whose sum is σ = 57218918400. Its totient is φ = 2625896448.

The previous prime is 12761521919. The next prime is 12761521961. The reversal of 12761521920 is 2912516721.

12761521920 is a `hidden beast` number, since 1 + 2 + 7 + 615 + 2 + 19 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (1152).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 119266507 + ... + 119266613.

It is an arithmetic number, because the mean of its divisors is an integer number (49669200).

Almost surely, 2^12761521920 is an apocalyptic number.

12761521920 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 12761521920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28609459200).

12761521920 is an abundant number, since it is smaller than the sum of its proper divisors (44457396480).

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

12761521920 is a wasteful number, since it uses less digits than its factorization.

12761521920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The spelling of 12761521920 in words is "twelve billion, seven hundred sixty-one million, five hundred twenty-one thousand, nine hundred twenty".