21763234 has 4 divisors (see below), whose sum is σ = 32644854. Its totient is φ = 10881616.

The previous prime is 21763223. The next prime is 21763241. The reversal of 21763234 is 43236712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16687225 + 5076009 = 4085^2 + 2253^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5440807 + ... + 5440810.

Almost surely, 2^21763234 is an apocalyptic number.

21763234 is a deficient number, since it is larger than the sum of its proper divisors (10881620).

21763234 is a wasteful number, since it uses less digits than its factorization.

21763234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10881619.

The product of its digits is 6048, while the sum is 28.

The square root of 21763234 is about 4665.1081445128. The cubic root of 21763234 is about 279.1951119551.

Adding to 21763234 its reverse (43236712), we get a palindrome (64999946).

The spelling of 21763234 in words is "twenty-one million, seven hundred sixty-three thousand, two hundred thirty-four".