21334420 has 12 divisors (see below), whose sum is σ = 44802324. Its totient is φ = 8533760.

The previous prime is 21334387. The next prime is 21334427. The reversal of 21334420 is 2443312.

It can be written as a sum of positive squares in 2 ways, for example, as 2775556 + 18558864 = 1666^2 + 4308^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21334427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 533341 + ... + 533380.

It is an arithmetic number, because the mean of its divisors is an integer number (3733527).

Almost surely, 2^21334420 is an apocalyptic number.

21334420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21334420 is an abundant number, since it is smaller than the sum of its proper divisors (23467904).

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

21334420 is a wasteful number, since it uses less digits than its factorization.

21334420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066730 (or 1066728 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 21334420 is about 4618.9197871364. The cubic root of 21334420 is about 277.3492187390.

Adding to 21334420 its reverse (2443312), we get a palindrome (23777732).

The spelling of 21334420 in words is "twenty-one million, three hundred thirty-four thousand, four hundred twenty".