21140052 has 12 divisors (see below), whose sum is σ = 49326816. Its totient is φ = 7046680.

The previous prime is 21140033. The next prime is 21140069. The reversal of 21140052 is 25004112.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 880824 + ... + 880847.

It is an arithmetic number, because the mean of its divisors is an integer number (4110568).

Almost surely, 2^21140052 is an apocalyptic number.

It is an amenable number.

21140052 is an abundant number, since it is smaller than the sum of its proper divisors (28186764).

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

21140052 is a wasteful number, since it uses less digits than its factorization.

21140052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1761678 (or 1761676 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 21140052 is about 4597.8312278725. The cubic root of 21140052 is about 276.5043812056.

Adding to 21140052 its reverse (25004112), we get a palindrome (46144164).

The spelling of 21140052 in words is "twenty-one million, one hundred forty thousand, fifty-two".