21414880 has 24 divisors (see below), whose sum is σ = 50593032. Its totient is φ = 8565888.

The previous prime is 21414871. The next prime is 21414923. The reversal of 21414880 is 8841412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66762 + ... + 67081.

It is an arithmetic number, because the mean of its divisors is an integer number (2108043).

Almost surely, 2^21414880 is an apocalyptic number.

21414880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21414880 is an abundant number, since it is smaller than the sum of its proper divisors (29178152).

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

21414880 is a wasteful number, since it uses less digits than its factorization.

21414880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133858 (or 133850 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 21414880 is about 4627.6214192607. The cubic root of 21414880 is about 277.6974435545.

It can be divided in two parts, 2141 and 4880, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 21414880 in words is "twenty-one million, four hundred fourteen thousand, eight hundred eighty".