21702867853 has 4 divisors (see below), whose sum is σ = 21723757120. Its totient is φ = 21681978588.

The previous prime is 21702867787. The next prime is 21702867863. The reversal of 21702867853 is 35876820712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21702867853 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21702867797 and 21702867806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21702867863) 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, 10443075 + ... + 10445152.

It is an arithmetic number, because the mean of its divisors is an integer number (5430939280).

Almost surely, 2^21702867853 is an apocalyptic number.

It is an amenable number.

21702867853 is a deficient number, since it is larger than the sum of its proper divisors (20889267).

21702867853 is a wasteful number, since it uses less digits than its factorization.

21702867853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20889266.

The product of its (nonzero) digits is 1128960, while the sum is 49.

The spelling of 21702867853 in words is "twenty-one billion, seven hundred two million, eight hundred sixty-seven thousand, eight hundred fifty-three".