21340052 has 12 divisors (see below), whose sum is σ = 37509780. Its totient is φ = 10622976.

The previous prime is 21340051. The next prime is 21340063. The reversal of 21340052 is 25004312.

It can be written as a sum of positive squares in 2 ways, for example, as 11316496 + 10023556 = 3364^2 + 3166^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21340052.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10733 + ... + 12564.

It is an arithmetic number, because the mean of its divisors is an integer number (3125815).

Almost surely, 2^21340052 is an apocalyptic number.

It is an amenable number.

21340052 is a deficient number, since it is larger than the sum of its proper divisors (16169728).

21340052 is a wasteful number, since it uses less digits than its factorization.

21340052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23530 (or 23528 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 21340052 is about 4619.5294132628. The cubic root of 21340052 is about 277.3736220798.

Adding to 21340052 its reverse (25004312), we get a palindrome (46344364).

The spelling of 21340052 in words is "twenty-one million, three hundred forty thousand, fifty-two".