21410740 has 24 divisors (see below), whose sum is σ = 48421800. Its totient is φ = 7905408.

The previous prime is 21410731. The next prime is 21410747. The reversal of 21410740 is 4701412.

It can be written as a sum of positive squares in 4 ways, for example, as 1106704 + 20304036 = 1052^2 + 4506^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21410747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40915 + ... + 41434.

It is an arithmetic number, because the mean of its divisors is an integer number (2017575).

Almost surely, 2^21410740 is an apocalyptic number.

21410740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21410740 is an abundant number, since it is smaller than the sum of its proper divisors (27011060).

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

21410740 is a wasteful number, since it uses less digits than its factorization.

21410740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82371 (or 82369 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 21410740 is about 4627.1740836065. The cubic root of 21410740 is about 277.6795472520.

The spelling of 21410740 in words is "twenty-one million, four hundred ten thousand, seven hundred forty".