21051232342535 has 8 divisors (see below), whose sum is σ = 26747448152976. Its totient is φ = 15850339646080.

The previous prime is 21051232342531. The next prime is 21051232342541. The reversal of 21051232342535 is 53524323215012.

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

It is not a de Polignac number, because 21051232342535 - 2² = 21051232342531 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21051232342531) 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, 123830778401 + ... + 123830778570.

It is an arithmetic number, because the mean of its divisors is an integer number (3343431019122).

Almost surely, 2^{21051232342535} is an apocalyptic number.

21051232342535 is a deficient number, since it is larger than the sum of its proper divisors (5696215810441).

21051232342535 is a wasteful number, since it uses less digits than its factorization.

21051232342535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247661556993.

The product of its (nonzero) digits is 216000, while the sum is 38.

Adding to 21051232342535 its reverse (53524323215012), we get a palindrome (74575555557547).

The spelling of 21051232342535 in words is "twenty-one trillion, fifty-one billion, two hundred thirty-two million, three hundred forty-two thousand, five hundred thirty-five".