21412080 has 160 divisors (see below), whose sum is σ = 77137920. Its totient is φ = 5448960.

The previous prime is 21412049. The next prime is 21412093. The reversal of 21412080 is 8021412.

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 31 ways as a sum of consecutive naturals, for example, 49465 + ... + 49895.

It is an arithmetic number, because the mean of its divisors is an integer number (482112).

Almost surely, 2^21412080 is an apocalyptic number.

21412080 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 21412080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38568960).

21412080 is an abundant number, since it is smaller than the sum of its proper divisors (55725840).

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

21412080 is a wasteful number, since it uses less digits than its factorization.

21412080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476 (or 464 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 21412080 is about 4627.3188781410. The cubic root of 21412080 is about 277.6853400275.

Adding to 21412080 its reverse (8021412), we get a palindrome (29433492).

The spelling of 21412080 in words is "twenty-one million, four hundred twelve thousand, eighty".