21541080 has 64 divisors (see below), whose sum is σ = 70502400. Its totient is φ = 5221760.

The previous prime is 21541061. The next prime is 21541097. The reversal of 21541080 is 8014512.

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, 6840 + ... + 9479.

It is an arithmetic number, because the mean of its divisors is an integer number (1101600).

Almost surely, 2^21541080 is an apocalyptic number.

21541080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21541080 is an abundant number, since it is smaller than the sum of its proper divisors (48961320).

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

21541080 is a wasteful number, since it uses less digits than its factorization.

21541080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16344 (or 16340 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 21541080 is about 4641.2369041022. The cubic root of 21541080 is about 278.2418749630.

Adding to 21541080 its reverse (8014512), we get a palindrome (29555592).

The spelling of 21541080 in words is "twenty-one million, five hundred forty-one thousand, eighty".