21752340853 has 4 divisors (see below), whose sum is σ = 21752642988. Its totient is φ = 21752038720.

The previous prime is 21752340833. The next prime is 21752340913. The reversal of 21752340853 is 35804325712.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 9773695044 + 11978645809 = 98862^2 + 109447^2 .

It is a cyclic number.

It is not a de Polignac number, because 21752340853 - 2²⁵ = 21718786421 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 (21752340823) 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, 26493 + ... + 210253.

It is an arithmetic number, because the mean of its divisors is an integer number (5438160747).

Almost surely, 2^21752340853 is an apocalyptic number.

It is an amenable number.

21752340853 is a deficient number, since it is larger than the sum of its proper divisors (302135).

21752340853 is a wasteful number, since it uses less digits than its factorization.

21752340853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302134.

The product of its (nonzero) digits is 201600, while the sum is 40.

The spelling of 21752340853 in words is "twenty-one billion, seven hundred fifty-two million, three hundred forty thousand, eight hundred fifty-three".