21414740 has 24 divisors (see below), whose sum is σ = 45330432. Its totient is φ = 8497440.

The previous prime is 21414739. The next prime is 21414761. The reversal of 21414740 is 4741412.

It is a happy number.

It is a super-3 number, since 3×21414740³ (a number of 23 digits) contains 333 as substring.

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 7 ways as a sum of consecutive naturals, for example, 1676 + ... + 6755.

It is an arithmetic number, because the mean of its divisors is an integer number (1888768).

Almost surely, 2^21414740 is an apocalyptic number.

21414740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21414740 is an abundant number, since it is smaller than the sum of its proper divisors (23915692).

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

21414740 is a wasteful number, since it uses less digits than its factorization.

21414740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8567 (or 8565 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 21414740 is about 4627.6062926744. The cubic root of 21414740 is about 277.6968384032.

The spelling of 21414740 in words is "twenty-one million, four hundred fourteen thousand, seven hundred forty".