21534763 has 2 divisors, whose sum is σ = 21534764. Its totient is φ = 21534762.

The previous prime is 21534757. The next prime is 21534827. The reversal of 21534763 is 36743512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21534763 - 2⁵ = 21534731 is a prime.

It is not a weakly prime, because it can be changed into another prime (21534743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10767381 + 10767382.

It is an arithmetic number, because the mean of its divisors is an integer number (10767382).

Almost surely, 2^21534763 is an apocalyptic number.

21534763 is a deficient number, since it is larger than the sum of its proper divisors (1).

21534763 is an equidigital number, since it uses as much as digits as its factorization.

21534763 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 31.

The square root of 21534763 is about 4640.5563244077. The cubic root of 21534763 is about 278.2146738236.

The spelling of 21534763 in words is "twenty-one million, five hundred thirty-four thousand, seven hundred sixty-three".