21347363 has 2 divisors, whose sum is σ = 21347364. Its totient is φ = 21347362.

The previous prime is 21347329. The next prime is 21347369. The reversal of 21347363 is 36374312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21347363 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21347369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10673681 + 10673682.

It is an arithmetic number, because the mean of its divisors is an integer number (10673682).

Almost surely, 2^21347363 is an apocalyptic number.

21347363 is a deficient number, since it is larger than the sum of its proper divisors (1).

21347363 is an equidigital number, since it uses as much as digits as its factorization.

21347363 is an evil number, because the sum of its binary digits is even.

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

The square root of 21347363 is about 4620.3206598677. The cubic root of 21347363 is about 277.4052940897.

The spelling of 21347363 in words is "twenty-one million, three hundred forty-seven thousand, three hundred sixty-three".