21120520607 has 4 divisors (see below), whose sum is σ = 21213562776. Its totient is φ = 21027478440.

The previous prime is 21120520583. The next prime is 21120520621. The reversal of 21120520607 is 70602502112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21120520607 - 2¹⁰ = 21120519583 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 (21120520667) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 46520744 + ... + 46521197.

It is an arithmetic number, because the mean of its divisors is an integer number (5303390694).

Almost surely, 2^21120520607 is an apocalyptic number.

21120520607 is a deficient number, since it is larger than the sum of its proper divisors (93042169).

21120520607 is an equidigital number, since it uses as much as digits as its factorization.

21120520607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93042168.

The product of its (nonzero) digits is 1680, while the sum is 26.

The spelling of 21120520607 in words is "twenty-one billion, one hundred twenty million, five hundred twenty thousand, six hundred seven".