21162080 has 24 divisors (see below), whose sum is σ = 49995792. Its totient is φ = 8464768.

The previous prime is 21162041. The next prime is 21162107. The reversal of 21162080 is 8026112.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65972 + ... + 66291.

It is an arithmetic number, because the mean of its divisors is an integer number (2083158).

Almost surely, 2^21162080 is an apocalyptic number.

21162080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21162080 is an abundant number, since it is smaller than the sum of its proper divisors (28833712).

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

21162080 is a wasteful number, since it uses less digits than its factorization.

21162080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132278 (or 132270 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 21162080 is about 4600.2260814008. The cubic root of 21162080 is about 276.6003873424.

Adding to 21162080 its reverse (8026112), we get a palindrome (29188192).

The spelling of 21162080 in words is "twenty-one million, one hundred sixty-two thousand, eighty".