21140211 has 4 divisors (see below), whose sum is σ = 28186952. Its totient is φ = 14093472.

The previous prime is 21140201. The next prime is 21140213. The reversal of 21140211 is 11204112.

It is a happy number.

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

It is not a de Polignac number, because 21140211 - 2¹¹ = 21138163 is a prime.

It is a super-2 number, since 2×21140211² = 893817042249042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21140213) 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, 3523366 + ... + 3523371.

It is an arithmetic number, because the mean of its divisors is an integer number (7046738).

Almost surely, 2^21140211 is an apocalyptic number.

21140211 is a deficient number, since it is larger than the sum of its proper divisors (7046741).

21140211 is an equidigital number, since it uses as much as digits as its factorization.

21140211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7046740.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 21140211 is about 4597.8485186008. The cubic root of 21140211 is about 276.5050744251.

Adding to 21140211 its reverse (11204112), we get a palindrome (32344323).

The spelling of 21140211 in words is "twenty-one million, one hundred forty thousand, two hundred eleven".