12426204215540 has 24 divisors (see below), whose sum is σ = 26095098050952. Its totient is φ = 4970468505600.

The previous prime is 12426204215521. The next prime is 12426204215543. The reversal of 12426204215540 is 4551240262421.

It can be written as a sum of positive squares in 4 ways, for example, as 2196211369444 + 10229992846096 = 1481962^2 + 3198436^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12426204215494 and 12426204215503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12426204215543) 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, 11155940 + ... + 12219140.

It is an arithmetic number, because the mean of its divisors is an integer number (1087295752123).

Almost surely, 2^{12426204215540} is an apocalyptic number.

12426204215540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12426204215540 is an abundant number, since it is smaller than the sum of its proper divisors (13668893835412).

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

12426204215540 is a wasteful number, since it uses less digits than its factorization.

12426204215540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647587 (or 1647585 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 38.

Adding to 12426204215540 its reverse (4551240262421), we get a palindrome (16977444477961).

The spelling of 12426204215540 in words is "twelve trillion, four hundred twenty-six billion, two hundred four million, two hundred fifteen thousand, five hundred forty".