21936763 has 8 divisors (see below), whose sum is σ = 22538880. Its totient is φ = 21337920.

The previous prime is 21936757. The next prime is 21936767. The reversal of 21936763 is 36763912.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21936763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21936767) 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, 19081 + ... + 20197.

It is an arithmetic number, because the mean of its divisors is an integer number (2817360).

Almost surely, 2^21936763 is an apocalyptic number.

21936763 is a deficient number, since it is larger than the sum of its proper divisors (602117).

21936763 is a wasteful number, since it uses less digits than its factorization.

21936763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1637.

The product of its digits is 40824, while the sum is 37.

The square root of 21936763 is about 4683.6698218384. The cubic root of 21936763 is about 279.9352018422.

The spelling of 21936763 in words is "twenty-one million, nine hundred thirty-six thousand, seven hundred sixty-three".