21371300 has 18 divisors (see below), whose sum is σ = 46375938. Its totient is φ = 8548480.

The previous prime is 21371299. The next prime is 21371341. The reversal of 21371300 is 317312.

It can be written as a sum of positive squares in 3 ways, for example, as 3748096 + 17623204 = 1936^2 + 4198^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106757 + ... + 106956.

It is an arithmetic number, because the mean of its divisors is an integer number (2576441).

Almost surely, 2^21371300 is an apocalyptic number.

21371300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21371300 is an abundant number, since it is smaller than the sum of its proper divisors (25004638).

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

21371300 is a wasteful number, since it uses less digits than its factorization.

21371300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213727 (or 213720 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 17.

The square root of 21371300 is about 4622.9103387368. The cubic root of 21371300 is about 277.5089410857.

Adding to 21371300 its reverse (317312), we get a palindrome (21688612).

The spelling of 21371300 in words is "twenty-one million, three hundred seventy-one thousand, three hundred".