21845654812 has 24 divisors (see below), whose sum is σ = 39506311152. Its totient is φ = 10563168000.

The previous prime is 21845654797. The next prime is 21845654813.

21845654812 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21845654813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 611389 + ... + 646132.

It is an arithmetic number, because the mean of its divisors is an integer number (1646096298).

Almost surely, 2^21845654812 is an apocalyptic number.

It is an amenable number.

21845654812 is a deficient number, since it is larger than the sum of its proper divisors (17660656340).

21845654812 is a wasteful number, since it uses less digits than its factorization.

21845654812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257669 (or 1257667 counting only the distinct ones).

The product of its digits is 614400, while the sum is 46.

The spelling of 21845654812 in words is "twenty-one billion, eight hundred forty-five million, six hundred fifty-four thousand, eight hundred twelve".