21761452 has 6 divisors (see below), whose sum is σ = 38082548. Its totient is φ = 10880724.

The previous prime is 21761437. The next prime is 21761459. The reversal of 21761452 is 25416712.

It is a self number, because there is not a number n which added to its sum of digits gives 21761452.

It is not an unprimeable number, because it can be changed into a prime (21761459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2720178 + ... + 2720185.

Almost surely, 2^21761452 is an apocalyptic number.

It is an amenable number.

21761452 is a deficient number, since it is larger than the sum of its proper divisors (16321096).

21761452 is a wasteful number, since it uses less digits than its factorization.

21761452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5440367 (or 5440365 counting only the distinct ones).

The product of its digits is 3360, while the sum is 28.

The square root of 21761452 is about 4664.9171482460. The cubic root of 21761452 is about 279.1874914690.

The spelling of 21761452 in words is "twenty-one million, seven hundred sixty-one thousand, four hundred fifty-two".