21752203020207 has 16 divisors (see below), whose sum is σ = 31640985186048. Its totient is φ = 13182562863680.

The previous prime is 21752203020173. The next prime is 21752203020221. The reversal of 21752203020207 is 70202030225712.

It is a cyclic number.

It is not a de Polignac number, because 21752203020207 - 2⁶ = 21752203020143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21752203020287) 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 15 ways as a sum of consecutive naturals, for example, 14013558 + ... + 15488195.

It is an arithmetic number, because the mean of its divisors is an integer number (1977561574128).

Almost surely, 2^{21752203020207} is an apocalyptic number.

21752203020207 is a deficient number, since it is larger than the sum of its proper divisors (9888782165841).

21752203020207 is a wasteful number, since it uses less digits than its factorization.

21752203020207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29524110.

The product of its (nonzero) digits is 23520, while the sum is 33.

Adding to 21752203020207 its reverse (70202030225712), we get a palindrome (91954233245919).

The spelling of 21752203020207 in words is "twenty-one trillion, seven hundred fifty-two billion, two hundred three million, twenty thousand, two hundred seven".