21852355207 has 4 divisors (see below), whose sum is σ = 22052835640. Its totient is φ = 21651874776.

The previous prime is 21852355171. The next prime is 21852355211. The reversal of 21852355207 is 70255325812.

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 21852355207 - 2³¹ = 19704871559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21852355207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21852355507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100240053 + ... + 100240270.

It is an arithmetic number, because the mean of its divisors is an integer number (5513208910).

Almost surely, 2^21852355207 is an apocalyptic number.

21852355207 is a deficient number, since it is larger than the sum of its proper divisors (200480433).

21852355207 is a wasteful number, since it uses less digits than its factorization.

21852355207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200480432.

The product of its (nonzero) digits is 168000, while the sum is 40.

The spelling of 21852355207 in words is "twenty-one billion, eight hundred fifty-two million, three hundred fifty-five thousand, two hundred seven".