21342052 has 12 divisors (see below), whose sum is σ = 37418220. Its totient is φ = 10651136.

The previous prime is 21342047. The next prime is 21342053. The reversal of 21342052 is 25024312.

It can be written as a sum of positive squares in 2 ways, for example, as 2903616 + 18438436 = 1704^2 + 4294^2 .

It is a super-3 number, since 3×21342052³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21342053) 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, 2413 + ... + 6964.

It is an arithmetic number, because the mean of its divisors is an integer number (3118185).

Almost surely, 2^21342052 is an apocalyptic number.

It is an amenable number.

21342052 is a deficient number, since it is larger than the sum of its proper divisors (16076168).

21342052 is a wasteful number, since it uses less digits than its factorization.

21342052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9950 (or 9948 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21342052 is about 4619.7458804571. The cubic root of 21342052 is about 277.3822870058.

Adding to 21342052 its reverse (25024312), we get a palindrome (46366364).

It can be divided in two parts, 2134 and 2052, that added together give a triangular number (4186 = T₉₁).

The spelling of 21342052 in words is "twenty-one million, three hundred forty-two thousand, fifty-two".