21036763 has 8 divisors (see below), whose sum is σ = 22982400. Its totient is φ = 19096680.

The previous prime is 21036751. The next prime is 21036767. The reversal of 21036763 is 36763012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21036763 - 2²¹ = 18939611 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21036767) 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, 14338 + ... + 15736.

It is an arithmetic number, because the mean of its divisors is an integer number (2872800).

Almost surely, 2^21036763 is an apocalyptic number.

21036763 is a deficient number, since it is larger than the sum of its proper divisors (1945637).

21036763 is a wasteful number, since it uses less digits than its factorization.

21036763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 21036763 is about 4586.5851131316. The cubic root of 21036763 is about 276.0533179567.

Adding to 21036763 its reverse (36763012), we get a palindrome (57799775).

The spelling of 21036763 in words is "twenty-one million, thirty-six thousand, seven hundred sixty-three".