1242512421 has 16 divisors (see below), whose sum is σ = 1704604608. Its totient is φ = 804560000.

The previous prime is 1242512399. The next prime is 1242512423. The reversal of 1242512421 is 1242152421.

It is a cyclic number.

It is not a de Polignac number, because 1242512421 - 2⁵ = 1242512389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1242512391 and 1242512400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242512423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5671 + ... + 50171.

It is an arithmetic number, because the mean of its divisors is an integer number (106537788).

Almost surely, 2^1242512421 is an apocalyptic number.

It is an amenable number.

1242512421 is a deficient number, since it is larger than the sum of its proper divisors (462092187).

1242512421 is a wasteful number, since it uses less digits than its factorization.

1242512421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44772.

The product of its digits is 1280, while the sum is 24.

The square root of 1242512421 is about 35249.2896524171. The cubic root of 1242512421 is about 1075.0621693990.

Adding to 1242512421 its reverse (1242152421), we get a palindrome (2484664842).

Subtracting from 1242512421 its reverse (1242152421), we obtain a square (360000 = 600²).

The spelling of 1242512421 in words is "one billion, two hundred forty-two million, five hundred twelve thousand, four hundred twenty-one".