21120500523 has 8 divisors (see below), whose sum is σ = 28174169088. Its totient is φ = 14073582824.

The previous prime is 21120500503. The next prime is 21120500573. The reversal of 21120500523 is 32500502112.

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

It is a cyclic number.

It is not a de Polignac number, because 21120500523 - 2⁶ = 21120500459 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21120500523.

It is not an unprimeable number, because it can be changed into a prime (21120500503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1680411 + ... + 1692932.

It is an arithmetic number, because the mean of its divisors is an integer number (3521771136).

Almost surely, 2^21120500523 is an apocalyptic number.

21120500523 is a deficient number, since it is larger than the sum of its proper divisors (7053668565).

21120500523 is a wasteful number, since it uses less digits than its factorization.

21120500523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3375433.

The product of its (nonzero) digits is 600, while the sum is 21.

The spelling of 21120500523 in words is "twenty-one billion, one hundred twenty million, five hundred thousand, five hundred twenty-three".