1245421123 has 2 divisors, whose sum is σ = 1245421124. Its totient is φ = 1245421122.

The previous prime is 1245421117. The next prime is 1245421127. The reversal of 1245421123 is 3211245421.

It is a strong prime.

It is an emirp because it is prime and its reverse (3211245421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1245421123 is a prime.

It is a super-2 number, since 2×1245421123² = 3102147547229162258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1245421127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622710561 + 622710562.

It is an arithmetic number, because the mean of its divisors is an integer number (622710562).

Almost surely, 2^1245421123 is an apocalyptic number.

1245421123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245421123 is an equidigital number, since it uses as much as digits as its factorization.

1245421123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 25.

The square root of 1245421123 is about 35290.5245497995. The cubic root of 1245421123 is about 1075.9004168306.

Adding to 1245421123 its reverse (3211245421), we get a palindrome (4456666544).

The spelling of 1245421123 in words is "one billion, two hundred forty-five million, four hundred twenty-one thousand, one hundred twenty-three".