21211204441 has 8 divisors (see below), whose sum is σ = 24395781440. Its totient is φ = 18065228688.

The previous prime is 21211204379. The next prime is 21211204457. The reversal of 21211204441 is 14440211212.

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 21211204441 - 2²⁷ = 21076986713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211208441) 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, 9649131 + ... + 9651328.

It is an arithmetic number, because the mean of its divisors is an integer number (3049472680).

Almost surely, 2^21211204441 is an apocalyptic number.

It is an amenable number.

21211204441 is a deficient number, since it is larger than the sum of its proper divisors (3184576999).

21211204441 is a wasteful number, since it uses less digits than its factorization.

21211204441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19300623.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21211204441 its reverse (14440211212), we get a palindrome (35651415653).

The spelling of 21211204441 in words is "twenty-one billion, two hundred eleven million, two hundred four thousand, four hundred forty-one".