21383590 has 16 divisors (see below), whose sum is σ = 39310272. Its totient is φ = 8371264.

The previous prime is 21383587. The next prime is 21383597. The reversal of 21383590 is 9538312.

It is a happy number.

It is a super-3 number, since 3×21383590³ (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 (21383597) 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, 22279 + ... + 23218.

It is an arithmetic number, because the mean of its divisors is an integer number (2456892).

Almost surely, 2^21383590 is an apocalyptic number.

21383590 is a deficient number, since it is larger than the sum of its proper divisors (17926682).

21383590 is a wasteful number, since it uses less digits than its factorization.

21383590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45551.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 21383590 is about 4624.2393969171. The cubic root of 21383590 is about 277.5621266090.

The spelling of 21383590 in words is "twenty-one million, three hundred eighty-three thousand, five hundred ninety".