21150070080 has 112 divisors (see below), whose sum is σ = 67344950400. Its totient is φ = 5623769088.

The previous prime is 21150070079. The next prime is 21150070099. The reversal of 21150070080 is 8007005112.

It is a super-2 number, since 2×21150070080² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21150070080.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 303477 + ... + 366603.

It is an arithmetic number, because the mean of its divisors is an integer number (601294200).

Almost surely, 2^21150070080 is an apocalyptic number.

21150070080 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 21150070080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33672475200).

21150070080 is an abundant number, since it is smaller than the sum of its proper divisors (46194880320).

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

21150070080 is a wasteful number, since it uses less digits than its factorization.

21150070080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63496 (or 63486 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 24.

Adding to 21150070080 its reverse (8007005112), we get a palindrome (29157075192).

The spelling of 21150070080 in words is "twenty-one billion, one hundred fifty million, seventy thousand, eighty".