2121213431242 has 8 divisors (see below), whose sum is σ = 3217570935300. Its totient is φ = 1048689786144.

The previous prime is 2121213431189. The next prime is 2121213431243. The reversal of 2121213431242 is 2421343121212.

It can be written as a sum of positive squares in 2 ways, for example, as 2117609950401 + 3603480841 = 1455201^2 + 60029^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2121213431242.

It is not an unprimeable number, because it can be changed into a prime (2121213431243) 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, 5958464517 + ... + 5958464872.

Almost surely, 2^{2121213431242} is an apocalyptic number.

2121213431242 is a deficient number, since it is larger than the sum of its proper divisors (1096357504058).

2121213431242 is a wasteful number, since it uses less digits than its factorization.

2121213431242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11916929480.

The product of its digits is 4608, while the sum is 28.

Adding to 2121213431242 its reverse (2421343121212), we get a palindrome (4542556552454).

The spelling of 2121213431242 in words is "two trillion, one hundred twenty-one billion, two hundred thirteen million, four hundred thirty-one thousand, two hundred forty-two".