21262080 has 216 divisors, whose sum is σ = 79691472. Its totient is φ = 4816896.

The previous prime is 21262069. The next prime is 21262093. The reversal of 21262080 is 8026212.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 188104 + ... + 188216.

It is an arithmetic number, because the mean of its divisors is an integer number (368942).

Almost surely, 2^21262080 is an apocalyptic number.

21262080 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 21262080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39845736).

21262080 is an abundant number, since it is smaller than the sum of its proper divisors (58429392).

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

21262080 is a wasteful number, since it uses less digits than its factorization.

21262080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 21262080 is about 4611.0823024535. The cubic root of 21262080 is about 277.0353884418.

Adding to 21262080 its reverse (8026212), we get a palindrome (29288292).

The spelling of 21262080 in words is "twenty-one million, two hundred sixty-two thousand, eighty".