21041252 has 12 divisors (see below), whose sum is σ = 37180416. Its totient is φ = 10418280.

The previous prime is 21041249. The next prime is 21041261. The reversal of 21041252 is 25214012.

It is a self number, because there is not a number n which added to its sum of digits gives 21041252.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25124 + ... + 25947.

It is an arithmetic number, because the mean of its divisors is an integer number (3098368).

Almost surely, 2^21041252 is an apocalyptic number.

It is an amenable number.

21041252 is a deficient number, since it is larger than the sum of its proper divisors (16139164).

21041252 is a wasteful number, since it uses less digits than its factorization.

21041252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51178 (or 51176 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21041252 is about 4587.0744489271. The cubic root of 21041252 is about 276.0729520802.

Adding to 21041252 its reverse (25214012), we get a palindrome (46255264).

The spelling of 21041252 in words is "twenty-one million, forty-one thousand, two hundred fifty-two".