1242213345 has 12 divisors (see below), whose sum is σ = 2153169876. Its totient is φ = 662513760.

The previous prime is 1242213257. The next prime is 1242213353. The reversal of 1242213345 is 5433122421.

It can be written as a sum of positive squares in 2 ways, for example, as 990927441 + 251285904 = 31479^2 + 15852^2 .

It is not a de Polignac number, because 1242213345 - 2¹⁴ = 1242196961 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13802326 + ... + 13802415.

It is an arithmetic number, because the mean of its divisors is an integer number (179430823).

Almost surely, 2^1242213345 is an apocalyptic number.

1242213345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1242213345 is a deficient number, since it is larger than the sum of its proper divisors (910956531).

1242213345 is a wasteful number, since it uses less digits than its factorization.

1242213345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27604752 (or 27604749 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 1242213345 is about 35245.0470988478. The cubic root of 1242213345 is about 1074.9759057156.

Adding to 1242213345 its reverse (5433122421), we get a palindrome (6675335766).

The spelling of 1242213345 in words is "one billion, two hundred forty-two million, two hundred thirteen thousand, three hundred forty-five".