21234763 has 4 divisors (see below), whose sum is σ = 23165208. Its totient is φ = 19304320.

The previous prime is 21234713. The next prime is 21234767. The reversal of 21234763 is 36743212.

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

It is a cyclic number.

It is not a de Polignac number, because 21234763 - 2¹³ = 21226571 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (21234767) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 965206 + ... + 965227.

It is an arithmetic number, because the mean of its divisors is an integer number (5791302).

Almost surely, 2^21234763 is an apocalyptic number.

21234763 is a deficient number, since it is larger than the sum of its proper divisors (1930445).

21234763 is a wasteful number, since it uses less digits than its factorization.

21234763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930444.

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

The square root of 21234763 is about 4608.1192475890. The cubic root of 21234763 is about 276.9166948335.

Adding to 21234763 its reverse (36743212), we get a palindrome (57977975).

It can be divided in two parts, 2123 and 4763, that added together give a palindrome (6886).

The spelling of 21234763 in words is "twenty-one million, two hundred thirty-four thousand, seven hundred sixty-three".