21122080 has 48 divisors (see below), whose sum is σ = 57032640. Its totient is φ = 7241472.

The previous prime is 21122069. The next prime is 21122099. The reversal of 21122080 is 8022112.

It is a super-2 number, since 2×21122080² = 892284527052800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8310 + ... + 10549.

It is an arithmetic number, because the mean of its divisors is an integer number (1188180).

Almost surely, 2^21122080 is an apocalyptic number.

21122080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122080 is an abundant number, since it is smaller than the sum of its proper divisors (35910560).

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

21122080 is a wasteful number, since it uses less digits than its factorization.

21122080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18881 (or 18873 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 21122080 is about 4595.8764126116. The cubic root of 21122080 is about 276.4260031957.

Adding to 21122080 its reverse (8022112), we get a palindrome (29144192).

The spelling of 21122080 in words is "twenty-one million, one hundred twenty-two thousand, eighty".