21380582 has 8 divisors (see below), whose sum is σ = 32753376. Its totient is φ = 10462792.

The previous prime is 21380581. The next prime is 21380591. The reversal of 21380582 is 28508312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21380581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113633 + ... + 113820.

It is an arithmetic number, because the mean of its divisors is an integer number (4094172).

Almost surely, 2^21380582 is an apocalyptic number.

21380582 is a deficient number, since it is larger than the sum of its proper divisors (11372794).

21380582 is a wasteful number, since it uses less digits than its factorization.

21380582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227502.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 21380582 is about 4623.9141428015. The cubic root of 21380582 is about 277.5491112386.

Adding to 21380582 its reverse (28508312), we get a palindrome (49888894).

The spelling of 21380582 in words is "twenty-one million, three hundred eighty thousand, five hundred eighty-two".