21343470 has 32 divisors (see below), whose sum is σ = 51410592. Its totient is φ = 5670912.

The previous prime is 21343463. The next prime is 21343477. The reversal of 21343470 is 7434312.

It is an interprime number because it is at equal distance from previous prime (21343463) and next prime (21343477).

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 21343470.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8254 + ... + 10526.

It is an arithmetic number, because the mean of its divisors is an integer number (1606581).

Almost surely, 2^21343470 is an apocalyptic number.

21343470 is an abundant number, since it is smaller than the sum of its proper divisors (30067122).

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

21343470 is a wasteful number, since it uses less digits than its factorization.

21343470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2596.

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 21343470 is about 4619.8993495530. The cubic root of 21343470 is about 277.3884301104.

Adding to 21343470 its reverse (7434312), we get a palindrome (28777782).

The spelling of 21343470 in words is "twenty-one million, three hundred forty-three thousand, four hundred seventy".