21443204211 has 32 divisors (see below), whose sum is σ = 33640615680. Its totient is φ = 11977891200.

The previous prime is 21443204203. The next prime is 21443204219. The reversal of 21443204211 is 11240234412.

It is an interprime number because it is at equal distance from previous prime (21443204203) and next prime (21443204219).

It is not a de Polignac number, because 21443204211 - 2³ = 21443204203 is a prime.

It is a super-2 number, since 2×21443204211² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21443204219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 245760 + ... + 321378.

It is an arithmetic number, because the mean of its divisors is an integer number (1051269240).

Almost surely, 2^21443204211 is an apocalyptic number.

21443204211 is a deficient number, since it is larger than the sum of its proper divisors (12197411469).

21443204211 is a wasteful number, since it uses less digits than its factorization.

21443204211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76307.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21443204211 its reverse (11240234412), we get a palindrome (32683438623).

The spelling of 21443204211 in words is "twenty-one billion, four hundred forty-three million, two hundred four thousand, two hundred eleven".