21253762 has 16 divisors (see below), whose sum is σ = 32864832. Its totient is φ = 10301040.

The previous prime is 21253759. The next prime is 21253763. The reversal of 21253762 is 26735212.

It is a self number, because there is not a number n which added to its sum of digits gives 21253762.

It is not an unprimeable number, because it can be changed into a prime (21253763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36937 + ... + 37507.

It is an arithmetic number, because the mean of its divisors is an integer number (2054052).

Almost surely, 2^21253762 is an apocalyptic number.

21253762 is a deficient number, since it is larger than the sum of its proper divisors (11611070).

21253762 is a wasteful number, since it uses less digits than its factorization.

21253762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113.

The product of its digits is 5040, while the sum is 28.

The square root of 21253762 is about 4610.1802567796. The cubic root of 21253762 is about 276.9992571237. Note that the first 3 decimals are identical.

Adding to 21253762 its reverse (26735212), we get a palindrome (47988974).

The spelling of 21253762 in words is "twenty-one million, two hundred fifty-three thousand, seven hundred sixty-two".