1242320232421 has 4 divisors (see below), whose sum is σ = 1254620432844. Its totient is φ = 1230020032000.

The previous prime is 1242320232401. The next prime is 1242320232451.

1242320232421 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1201884653025 + 40435579396 = 1096305^2 + 201086^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242320232421 - 2¹¹ = 1242320230373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1242320232421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242320232401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6150100060 + ... + 6150100261.

It is an arithmetic number, because the mean of its divisors is an integer number (313655108211).

Almost surely, 2^{1242320232421} is an apocalyptic number.

It is an amenable number.

1242320232421 is a deficient number, since it is larger than the sum of its proper divisors (12300200423).

1242320232421 is a wasteful number, since it uses less digits than its factorization.

1242320232421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12300200422.

The product of its (nonzero) digits is 9216, while the sum is 28.

It can be divided in two parts, 1242320 and 232421, that added together give a palindrome (1474741).

The spelling of 1242320232421 in words is "one trillion, two hundred forty-two billion, three hundred twenty million, two hundred thirty-two thousand, four hundred twenty-one".