21580230 has 32 divisors (see below), whose sum is σ = 59192064. Its totient is φ = 4932576.

The previous prime is 21580217. The next prime is 21580243. The reversal of 21580230 is 3208512.

21580230 = T₇₉₆ + T₇₉₇ + ... + T₈₅₈.

It is an interprime number because it is at equal distance from previous prime (21580217) and next prime (21580243).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 21580197 and 21580206.

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 15 ways as a sum of consecutive naturals, for example, 51172 + ... + 51591.

It is an arithmetic number, because the mean of its divisors is an integer number (1849752).

Almost surely, 2^21580230 is an apocalyptic number.

21580230 is an abundant number, since it is smaller than the sum of its proper divisors (37611834).

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

21580230 is a wasteful number, since it uses less digits than its factorization.

21580230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102780.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21580230 is about 4645.4526151926. The cubic root of 21580230 is about 278.4103372186.

Adding to 21580230 its reverse (3208512), we get a palindrome (24788742).

The spelling of 21580230 in words is "twenty-one million, five hundred eighty thousand, two hundred thirty".