21343763 has 12 divisors (see below), whose sum is σ = 25075440. Its totient is φ = 18112752.

The previous prime is 21343757. The next prime is 21343771. The reversal of 21343763 is 36734312.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-21343763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21343723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2933 + ... + 7161.

It is an arithmetic number, because the mean of its divisors is an integer number (2089620).

Almost surely, 2^21343763 is an apocalyptic number.

21343763 is a deficient number, since it is larger than the sum of its proper divisors (3731677).

21343763 is a wasteful number, since it uses less digits than its factorization.

21343763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4346 (or 4339 counting only the distinct ones).

The product of its digits is 9072, while the sum is 29.

The square root of 21343763 is about 4619.9310600917. The cubic root of 21343763 is about 277.3896994204.

The spelling of 21343763 in words is "twenty-one million, three hundred forty-three thousand, seven hundred sixty-three".