1243121010426 has 24 divisors (see below), whose sum is σ = 2693763632820. Its totient is φ = 414322166016.

The previous prime is 1243121010371. The next prime is 1243121010427. The reversal of 1243121010426 is 6240101213421.

1243121010426 is a `hidden beast` number, since 1 + 2 + 431 + 210 + 10 + 4 + 2 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1215063085401 + 28057925025 = 1102299^2 + 167505^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1243121010426.

It is not an unprimeable number, because it can be changed into a prime (1243121010427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4143031 + ... + 4432938.

Almost surely, 2^{1243121010426} is an apocalyptic number.

1243121010426 is an abundant number, since it is smaller than the sum of its proper divisors (1450642622394).

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

1243121010426 is a wasteful number, since it uses less digits than its factorization.

1243121010426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8584030 (or 8584027 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

Adding to 1243121010426 its reverse (6240101213421), we get a palindrome (7483222223847).

The spelling of 1243121010426 in words is "one trillion, two hundred forty-three billion, one hundred twenty-one million, ten thousand, four hundred twenty-six".