21081060000 has 1800 divisors, whose sum is σ = 104592194784. Its totient is φ = 4043520000.

The previous prime is 21081059999. The next prime is 21081060031. The reversal of 21081060000 is 6018012.

It is a tau number, because it is divible by the number of its divisors (1800).

It is a super-2 number, since 2×21081060000² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 299 ways as a sum of consecutive naturals, for example, 1621619994 + ... + 1621620006.

Almost surely, 2^21081060000 is an apocalyptic number.

21081060000 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 21081060000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52296097392).

21081060000 is an abundant number, since it is smaller than the sum of its proper divisors (83511134784).

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

21081060000 is a wasteful number, since it uses less digits than its factorization.

21081060000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21081060000 its reverse (6018012), we get a palindrome (21087078012).

The spelling of 21081060000 in words is "twenty-one billion, eighty-one million, sixty thousand".