21464633 has 2 divisors, whose sum is σ = 21464634. Its totient is φ = 21464632.

The previous prime is 21464627. The next prime is 21464647. The reversal of 21464633 is 33646412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16096144 + 5368489 = 4012^2 + 2317^2 .

It is a cyclic number.

It is not a de Polignac number, because 21464633 - 2¹⁰ = 21463609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21464596 and 21464605.

It is not a weakly prime, because it can be changed into another prime (21464603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10732316 + 10732317.

It is an arithmetic number, because the mean of its divisors is an integer number (10732317).

Almost surely, 2^21464633 is an apocalyptic number.

It is an amenable number.

21464633 is a deficient number, since it is larger than the sum of its proper divisors (1).

21464633 is an equidigital number, since it uses as much as digits as its factorization.

21464633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 29.

The square root of 21464633 is about 4632.9939563958. The cubic root of 21464633 is about 277.9123345548.

The spelling of 21464633 in words is "twenty-one million, four hundred sixty-four thousand, six hundred thirty-three".