21024312340242 has 16 divisors (see below), whose sum is σ = 42049708287552. Its totient is φ = 7007923512240.

The previous prime is 21024312340217. The next prime is 21024312340243. The reversal of 21024312340242 is 24204321342012.

It is not an unprimeable number, because it can be changed into a prime (21024312340243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44897958 + ... + 45363809.

It is an arithmetic number, because the mean of its divisors is an integer number (2628106767972).

Almost surely, 2^{21024312340242} is an apocalyptic number.

21024312340242 is an abundant number, since it is smaller than the sum of its proper divisors (21025395947310).

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

21024312340242 is a wasteful number, since it uses less digits than its factorization.

21024312340242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90300593.

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 21024312340242 its reverse (24204321342012), we get a palindrome (45228633682254).

The spelling of 21024312340242 in words is "twenty-one trillion, twenty-four billion, three hundred twelve million, three hundred forty thousand, two hundred forty-two".