21430211 has 8 divisors (see below), whose sum is σ = 23922624. Its totient is φ = 19028520.

The previous prime is 21430193. The next prime is 21430229. The reversal of 21430211 is 11203412.

It is an interprime number because it is at equal distance from previous prime (21430193) and next prime (21430229).

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 21430211 - 2⁶ = 21430147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21430291) 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, 22181 + ... + 23126.

It is an arithmetic number, because the mean of its divisors is an integer number (2990328).

Almost surely, 2^21430211 is an apocalyptic number.

21430211 is a deficient number, since it is larger than the sum of its proper divisors (2492413).

21430211 is a wasteful number, since it uses less digits than its factorization.

21430211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45361.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21430211 is about 4629.2775894301. The cubic root of 21430211 is about 277.7636959913.

Adding to 21430211 its reverse (11203412), we get a palindrome (32633623).

The spelling of 21430211 in words is "twenty-one million, four hundred thirty thousand, two hundred eleven".