21022846812 has 96 divisors (see below), whose sum is σ = 59612716800. Its totient is φ = 6354043200.

The previous prime is 21022846787. The next prime is 21022846841. The reversal of 21022846812 is 21864822012.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 439387 + ... + 484877.

It is an arithmetic number, because the mean of its divisors is an integer number (620965800).

Almost surely, 2^21022846812 is an apocalyptic number.

21022846812 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21022846812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29806358400).

21022846812 is an abundant number, since it is smaller than the sum of its proper divisors (38589869988).

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

21022846812 is a wasteful number, since it uses less digits than its factorization.

21022846812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45904 (or 45896 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The spelling of 21022846812 in words is "twenty-one billion, twenty-two million, eight hundred forty-six thousand, eight hundred twelve".