21853156835 has 4 divisors (see below), whose sum is σ = 26223788208. Its totient is φ = 17482525464.

The previous prime is 21853156823. The next prime is 21853156847. The reversal of 21853156835 is 53865135812.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (21853156823) and next prime (21853156847).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21853156835 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 21853156835.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2185315679 + ... + 2185315688.

It is an arithmetic number, because the mean of its divisors is an integer number (6555947052).

Almost surely, 2^21853156835 is an apocalyptic number.

21853156835 is a deficient number, since it is larger than the sum of its proper divisors (4370631373).

21853156835 is an equidigital number, since it uses as much as digits as its factorization.

21853156835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4370631372.

The product of its digits is 864000, while the sum is 47.

The spelling of 21853156835 in words is "twenty-one billion, eight hundred fifty-three million, one hundred fifty-six thousand, eight hundred thirty-five".