21436826856 has 16 divisors (see below), whose sum is σ = 53592067200. Its totient is φ = 7145608944.

The previous prime is 21436826837. The next prime is 21436826857. The reversal of 21436826856 is 65862863412.

It is a junction number, because it is equal to n+sod(n) for n = 21436826799 and 21436826808.

It is not an unprimeable number, because it can be changed into a prime (21436826857) 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, 446600536 + ... + 446600583.

It is an arithmetic number, because the mean of its divisors is an integer number (3349504200).

Almost surely, 2^21436826856 is an apocalyptic number.

It is an amenable number.

21436826856 is an abundant number, since it is smaller than the sum of its proper divisors (32155240344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21436826856 is a wasteful number, since it uses less digits than its factorization.

21436826856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893201128 (or 893201124 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 51.

The spelling of 21436826856 in words is "twenty-one billion, four hundred thirty-six million, eight hundred twenty-six thousand, eight hundred fifty-six".