21034580 has 24 divisors (see below), whose sum is σ = 50483328. Its totient is φ = 7211808.

The previous prime is 21034571. The next prime is 21034591. The reversal of 21034580 is 8543012.

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 7 ways as a sum of consecutive naturals, for example, 74984 + ... + 75263.

It is an arithmetic number, because the mean of its divisors is an integer number (2103472).

Almost surely, 2^21034580 is an apocalyptic number.

21034580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21034580 is an abundant number, since it is smaller than the sum of its proper divisors (29448748).

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

21034580 is a wasteful number, since it uses less digits than its factorization.

21034580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150263 (or 150261 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 21034580 is about 4586.3471303424. The cubic root of 21034580 is about 276.0437688760.

Adding to 21034580 its reverse (8543012), we get a palindrome (29577592).

The spelling of 21034580 in words is "twenty-one million, thirty-four thousand, five hundred eighty".