21343530 has 32 divisors (see below), whose sum is σ = 55165824. Its totient is φ = 5253696.

The previous prime is 21343519. The next prime is 21343579. The reversal of 21343530 is 3534312.

It is a junction number, because it is equal to n+sod(n) for n = 21343497 and 21343506.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26974 + ... + 27753.

It is an arithmetic number, because the mean of its divisors is an integer number (1723932).

Almost surely, 2^21343530 is an apocalyptic number.

21343530 is an abundant number, since it is smaller than the sum of its proper divisors (33822294).

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

21343530 is a wasteful number, since it uses less digits than its factorization.

21343530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54750.

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 21343530 is about 4619.9058431964. The cubic root of 21343530 is about 277.3886900383.

Adding to 21343530 its reverse (3534312), we get a palindrome (24877842).

The spelling of 21343530 in words is "twenty-one million, three hundred forty-three thousand, five hundred thirty".