21761382 has 8 divisors (see below), whose sum is σ = 43522776. Its totient is φ = 7253792.

The previous prime is 21761371. The next prime is 21761387. The reversal of 21761382 is 28316712.

It is a sphenic number, since it is the product of 3 distinct primes.

21761382 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21761387) 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 3 ways as a sum of consecutive naturals, for example, 1813443 + ... + 1813454.

It is an arithmetic number, because the mean of its divisors is an integer number (5440347).

Almost surely, 2^21761382 is an apocalyptic number.

21761382 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21761382 is a wasteful number, since it uses less digits than its factorization.

21761382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3626902.

The product of its digits is 4032, while the sum is 30.

The square root of 21761382 is about 4664.9096454272. The cubic root of 21761382 is about 279.1871921148.

The spelling of 21761382 in words is "twenty-one million, seven hundred sixty-one thousand, three hundred eighty-two".