2121243421430 has 48 divisors (see below), whose sum is σ = 4702895997696. Its totient is φ = 684502076160.

The previous prime is 2121243421417. The next prime is 2121243421439. The reversal of 2121243421430 is 341243421212.

It is a junction number, because it is equal to n+sod(n) for n = 2121243421393 and 2121243421402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121243421439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127317206 + ... + 127333865.

It is an arithmetic number, because the mean of its divisors is an integer number (97976999952).

Almost surely, 2^{2121243421430} is an apocalyptic number.

2121243421430 is an abundant number, since it is smaller than the sum of its proper divisors (2581652576266).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2121243421430 is a wasteful number, since it uses less digits than its factorization.

2121243421430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254651109 (or 254651102 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 2121243421430 its reverse (341243421212), we get a palindrome (2462486842642).

The spelling of 2121243421430 in words is "two trillion, one hundred twenty-one billion, two hundred forty-three million, four hundred twenty-one thousand, four hundred thirty".