1242212321 has 16 divisors (see below), whose sum is σ = 1506242304. Its totient is φ = 1000080384.

The previous prime is 1242212263. The next prime is 1242212329. The reversal of 1242212321 is 1232122421.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242212321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1242212293 and 1242212302.

It is not an unprimeable number, because it can be changed into a prime (1242212329) 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, 49481 + ... + 70233.

It is an arithmetic number, because the mean of its divisors is an integer number (94140144).

Almost surely, 2^1242212321 is an apocalyptic number.

It is an amenable number.

1242212321 is a deficient number, since it is larger than the sum of its proper divisors (264029983).

1242212321 is a wasteful number, since it uses less digits than its factorization.

1242212321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21280.

The product of its digits is 384, while the sum is 20.

The square root of 1242212321 is about 35245.0325719810. The cubic root of 1242212321 is about 1074.9756103354.

Adding to 1242212321 its reverse (1232122421), we get a palindrome (2474334742).

The spelling of 1242212321 in words is "one billion, two hundred forty-two million, two hundred twelve thousand, three hundred twenty-one".