21295580 has 24 divisors (see below), whose sum is σ = 47075280. Its totient is φ = 8069760.

The previous prime is 21295579. The next prime is 21295583. The reversal of 21295580 is 8559212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21295583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27641 + ... + 28400.

It is an arithmetic number, because the mean of its divisors is an integer number (1961470).

Almost surely, 2^21295580 is an apocalyptic number.

21295580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21295580 is an abundant number, since it is smaller than the sum of its proper divisors (25779700).

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

21295580 is a wasteful number, since it uses less digits than its factorization.

21295580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56069 (or 56067 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 21295580 is about 4614.7134255553. The cubic root of 21295580 is about 277.1808087650.

The spelling of 21295580 in words is "twenty-one million, two hundred ninety-five thousand, five hundred eighty".