21765414 has 16 divisors (see below), whose sum is σ = 47488320. Its totient is φ = 6595560.

The previous prime is 21765413. The next prime is 21765421. The reversal of 21765414 is 41456712.

It is a super-3 number, since 3×21765414³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21765413) by changing a digit.

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, 164824 + ... + 164955.

It is an arithmetic number, because the mean of its divisors is an integer number (2968020).

Almost surely, 2^21765414 is an apocalyptic number.

21765414 is an abundant number, since it is smaller than the sum of its proper divisors (25722906).

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

21765414 is a wasteful number, since it uses less digits than its factorization.

21765414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329795.

The product of its digits is 6720, while the sum is 30.

The square root of 21765414 is about 4665.3417881223. The cubic root of 21765414 is about 279.2044338696.

The spelling of 21765414 in words is "twenty-one million, seven hundred sixty-five thousand, four hundred fourteen".