21458363 has 2 divisors, whose sum is σ = 21458364. Its totient is φ = 21458362.

The previous prime is 21458351. The next prime is 21458377. The reversal of 21458363 is 36385412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21458363 - 2¹⁰ = 21457339 is a prime.

It is a super-2 number, since 2×21458363² = 920922685279538, which contains 22 as substring.

It is a Chen prime.

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

It is not a weakly prime, because it can be changed into another prime (21458303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10729181 + 10729182.

It is an arithmetic number, because the mean of its divisors is an integer number (10729182).

Almost surely, 2^21458363 is an apocalyptic number.

21458363 is a deficient number, since it is larger than the sum of its proper divisors (1).

21458363 is an equidigital number, since it uses as much as digits as its factorization.

21458363 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 32.

The square root of 21458363 is about 4632.3172387046. The cubic root of 21458363 is about 277.8852717420.

The spelling of 21458363 in words is "twenty-one million, four hundred fifty-eight thousand, three hundred sixty-three".