21885865480020 has 96 divisors (see below), whose sum is σ = 61764055879680. Its totient is φ = 5790193418880.

The previous prime is 21885865479923. The next prime is 21885865480081. The reversal of 21885865480020 is 2008456858812.

It is a happy number.

It is a super-2 number, since 2×21885865480020² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30448089 + ... + 31158591.

It is an arithmetic number, because the mean of its divisors is an integer number (643375582080).

Almost surely, 2^{21885865480020} is an apocalyptic number.

21885865480020 is a gapful number since it is divisible by the number (20) 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 21885865480020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30882027939840).

21885865480020 is an abundant number, since it is smaller than the sum of its proper divisors (39878190399660).

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

21885865480020 is a wasteful number, since it uses less digits than its factorization.

21885865480020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714565 (or 714563 counting only the distinct ones).

The product of its (nonzero) digits is 9830400, while the sum is 57.

The spelling of 21885865480020 in words is "twenty-one trillion, eight hundred eighty-five billion, eight hundred sixty-five million, four hundred eighty thousand, twenty".