21063371 has 8 divisors (see below), whose sum is σ = 24111360. Its totient is φ = 18025128.

The previous prime is 21063311. The next prime is 21063373. The reversal of 21063371 is 17336012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21063371 - 2¹⁰ = 21062347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21063373) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3020 + ... + 7158.

It is an arithmetic number, because the mean of its divisors is an integer number (3013920).

Almost surely, 2^21063371 is an apocalyptic number.

21063371 is a deficient number, since it is larger than the sum of its proper divisors (3047989).

21063371 is an equidigital number, since it uses as much as digits as its factorization.

21063371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4873.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 21063371 is about 4589.4848294771. The cubic root of 21063371 is about 276.1696560712.

Adding to 21063371 its reverse (17336012), we get a palindrome (38399383).

The spelling of 21063371 in words is "twenty-one million, sixty-three thousand, three hundred seventy-one".