21200027 has 4 divisors (see below), whose sum is σ = 21259440. Its totient is φ = 21140616.

The previous prime is 21200021. The next prime is 21200041. The reversal of 21200027 is 72000212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21200027 - 2²⁴ = 4422811 is a prime.

It is a super-2 number, since 2×21200027² = 898882289601458, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21199984 and 21200020.

It is not an unprimeable number, because it can be changed into a prime (21200021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29168 + ... + 29885.

It is an arithmetic number, because the mean of its divisors is an integer number (5314860).

Almost surely, 2^21200027 is an apocalyptic number.

21200027 is a deficient number, since it is larger than the sum of its proper divisors (59413).

21200027 is an equidigital number, since it uses as much as digits as its factorization.

21200027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59412.

The product of its (nonzero) digits is 56, while the sum is 14.

The square root of 21200027 is about 4604.3487053002. The cubic root of 21200027 is about 276.7656182236.

Adding to 21200027 its reverse (72000212), we get a palindrome (93200239).

The spelling of 21200027 in words is "twenty-one million, two hundred thousand, twenty-seven".