21343100 has 36 divisors (see below), whose sum is σ = 47200104. Its totient is φ = 8374080.

The previous prime is 21343039. The next prime is 21343111. The reversal of 21343100 is 134312.

It is a super-2 number, since 2×21343100² = 911055835220000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3287 + ... + 7313.

It is an arithmetic number, because the mean of its divisors is an integer number (1311114).

Almost surely, 2^21343100 is an apocalyptic number.

21343100 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 21343100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23600052).

21343100 is an abundant number, since it is smaller than the sum of its proper divisors (25857004).

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

21343100 is a wasteful number, since it uses less digits than its factorization.

21343100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4094 (or 4087 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21343100 is about 4619.8593052170. The cubic root of 21343100 is about 277.3868272109.

Adding to 21343100 its reverse (134312), we get a palindrome (21477412).

The spelling of 21343100 in words is "twenty-one million, three hundred forty-three thousand, one hundred".