21335424420542 has 8 divisors (see below), whose sum is σ = 32008423801896. Its totient is φ = 10665949819912.

The previous prime is 21335424420509. The next prime is 21335424420581. The reversal of 21335424420542 is 24502442453312.

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 21335424420542.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 881180048 + ... + 881204259.

It is an arithmetic number, because the mean of its divisors is an integer number (4001052975237).

Almost surely, 2^{21335424420542} is an apocalyptic number.

21335424420542 is a deficient number, since it is larger than the sum of its proper divisors (10672999381354).

21335424420542 is a wasteful number, since it uses less digits than its factorization.

21335424420542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1762390362.

The product of its (nonzero) digits is 921600, while the sum is 41.

Adding to 21335424420542 its reverse (24502442453312), we get a palindrome (45837866873854).

The spelling of 21335424420542 in words is "twenty-one trillion, three hundred thirty-five billion, four hundred twenty-four million, four hundred twenty thousand, five hundred forty-two".