21441213011 has 4 divisors (see below), whose sum is σ = 21548958000. Its totient is φ = 21333468024.

The previous prime is 21441212983. The next prime is 21441213037. The reversal of 21441213011 is 11031214412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21441213011 is a prime.

It is a super-2 number, since 2×21441213011² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21441216011) 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, 53872196 + ... + 53872593.

It is an arithmetic number, because the mean of its divisors is an integer number (5387239500).

Almost surely, 2^21441213011 is an apocalyptic number.

21441213011 is a deficient number, since it is larger than the sum of its proper divisors (107744989).

21441213011 is a wasteful number, since it uses less digits than its factorization.

21441213011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107744988.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21441213011 its reverse (11031214412), we get a palindrome (32472427423).

The spelling of 21441213011 in words is "twenty-one billion, four hundred forty-one million, two hundred thirteen thousand, eleven".