21123330040342 has 16 divisors (see below), whose sum is σ = 32207276539872. Its totient is φ = 10387601896320.

The previous prime is 21123330040333. The next prime is 21123330040357. The reversal of 21123330040342 is 24304003332112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21123330040342.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6292963 + ... + 9046990.

It is an arithmetic number, because the mean of its divisors is an integer number (2012954783742).

Almost surely, 2^{21123330040342} is an apocalyptic number.

21123330040342 is a deficient number, since it is larger than the sum of its proper divisors (11083946499530).

21123330040342 is a wasteful number, since it uses less digits than its factorization.

21123330040342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15351303.

The product of its (nonzero) digits is 10368, while the sum is 28.

Adding to 21123330040342 its reverse (24304003332112), we get a palindrome (45427333372454).

The spelling of 21123330040342 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred thirty million, forty thousand, three hundred forty-two".