1243121010425 has 12 divisors (see below), whose sum is σ = 1761680060736. Its totient is φ = 852425835600.

The previous prime is 1243121010371. The next prime is 1243121010427. The reversal of 1243121010425 is 5240101213421.

It is a happy number.

It is not a de Polignac number, because 1243121010425 - 2¹² = 1243121006329 is a prime.

It is a super-3 number, since 3×1243121010425³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1243121010394 and 1243121010403.

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, 3551774141 + ... + 3551774490.

It is an arithmetic number, because the mean of its divisors is an integer number (146806671728).

Almost surely, 2^{1243121010425} is an apocalyptic number.

It is an amenable number.

1243121010425 is a deficient number, since it is larger than the sum of its proper divisors (518559050311).

1243121010425 is an equidigital number, since it uses as much as digits as its factorization.

1243121010425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7103548648 (or 7103548643 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 1243121010425 its reverse (5240101213421), we get a palindrome (6483222223846).

The spelling of 1243121010425 in words is "one trillion, two hundred forty-three billion, one hundred twenty-one million, ten thousand, four hundred twenty-five".