21301400 has 48 divisors (see below), whose sum is σ = 50238600. Its totient is φ = 8398080.

The previous prime is 21301363. The next prime is 21301403. The reversal of 21301400 is 410312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301403) 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, 13871 + ... + 15329.

Almost surely, 2^21301400 is an apocalyptic number.

21301400 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 21301400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25119300).

21301400 is an abundant number, since it is smaller than the sum of its proper divisors (28937200).

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

21301400 is a wasteful number, since it uses less digits than its factorization.

21301400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1548 (or 1539 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21301400 is about 4615.3439741800. The cubic root of 21301400 is about 277.2060572809.

Adding to 21301400 its reverse (410312), we get a palindrome (21711712).

The spelling of 21301400 in words is "twenty-one million, three hundred one thousand, four hundred".