21327100 has 36 divisors (see below), whose sum is σ = 46481400. Its totient is φ = 8493760.

The previous prime is 21327091. The next prime is 21327107. The reversal of 21327100 is 172312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21327107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41646 + ... + 42154.

It is an arithmetic number, because the mean of its divisors is an integer number (1291150).

Almost surely, 2^21327100 is an apocalyptic number.

21327100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21327100 is an abundant number, since it is smaller than the sum of its proper divisors (25154300).

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

21327100 is a wasteful number, since it uses less digits than its factorization.

21327100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942 (or 935 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 21327100 is about 4618.1273260923. The cubic root of 21327100 is about 277.3174949093.

Adding to 21327100 its reverse (172312), we get a palindrome (21499412).

The spelling of 21327100 in words is "twenty-one million, three hundred twenty-seven thousand, one hundred".