21021027160 has 128 divisors (see below), whose sum is σ = 54504213120. Its totient is φ = 7147487232.

The previous prime is 21021027151. The next prime is 21021027161. The reversal of 21021027160 is 6172012012.

It is a happy number.

It is a super-2 number, since 2×21021027160² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021027161) by changing a digit.

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, 21083782 + ... + 21084778.

It is an arithmetic number, because the mean of its divisors is an integer number (425814165).

Almost surely, 2^21021027160 is an apocalyptic number.

21021027160 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 21021027160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27252106560).

21021027160 is an abundant number, since it is smaller than the sum of its proper divisors (33483185960).

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

21021027160 is a wasteful number, since it uses less digits than its factorization.

21021027160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565 (or 1561 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

Adding to 21021027160 its reverse (6172012012), we get a palindrome (27193039172).

The spelling of 21021027160 in words is "twenty-one billion, twenty-one million, twenty-seven thousand, one hundred sixty".