21710500 has 48 divisors (see below), whose sum is σ = 54198144. Its totient is φ = 7442400.

The previous prime is 21710471. The next prime is 21710503. The reversal of 21710500 is 501712.

It is not an unprimeable number, because it can be changed into a prime (21710503) 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 15 ways as a sum of consecutive naturals, for example, 399 + ... + 6601.

It is an arithmetic number, because the mean of its divisors is an integer number (1129128).

Almost surely, 2^21710500 is an apocalyptic number.

21710500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21710500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27099072).

21710500 is an abundant number, since it is smaller than the sum of its proper divisors (32487644).

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

21710500 is a wasteful number, since it uses less digits than its factorization.

21710500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6229 (or 6217 counting only the distinct ones).

The product of its (nonzero) digits is 70, while the sum is 16.

The square root of 21710500 is about 4659.4527575671. The cubic root of 21710500 is about 278.9694257851.

The spelling of 21710500 in words is "twenty-one million, seven hundred ten thousand, five hundred".