12143754374521 has 81 divisors (see below), whose sum is σ = 15678763724421. Its totient is φ = 9371294578800.

The previous prime is 12143754374519. The next prime is 12143754374671. The reversal of 12143754374521 is 12547345734121.

The square root of 12143754374521 is 3484789.

It is a perfect power (a square), and thus also a powerful number.

12143754374521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12143754374521 - 2¹ = 12143754374519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (12143754374021) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 44810901616 + ... + 44810901886.

Almost surely, 2^{12143754374521} is an apocalyptic number.

12143754374521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12143754374521 is the 3484789-th square number.

12143754374521 is the 1742395-th centered octagonal number.

It is an amenable number.

12143754374521 is a deficient number, since it is larger than the sum of its proper divisors (3535009349900).

12143754374521 is an frugal number, since it uses more digits than its factorization.

12143754374521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912 (or 456 counting only the distinct ones).

The product of its digits is 2822400, while the sum is 49.

Multiplying 12143754374521 by its sum of digits (49), we get a square (595043964351529 = 24393523²).

12143754374521 divided by its sum of digits (49) gives a square (247831721929 = 497827²).

The spelling of 12143754374521 in words is "twelve trillion, one hundred forty-three billion, seven hundred fifty-four million, three hundred seventy-four thousand, five hundred twenty-one".