21144204411 has 24 divisors (see below), whose sum is σ = 31016249040. Its totient is φ = 12803070720.

The previous prime is 21144204391. The next prime is 21144204457. The reversal of 21144204411 is 11440244112.

It is not a de Polignac number, because 21144204411 - 2¹¹ = 21144202363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21144204611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 384031 + ... + 435623.

It is an arithmetic number, because the mean of its divisors is an integer number (1292343710).

Almost surely, 2^21144204411 is an apocalyptic number.

21144204411 is a deficient number, since it is larger than the sum of its proper divisors (9872044629).

21144204411 is a wasteful number, since it uses less digits than its factorization.

21144204411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52747 (or 52736 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 21144204411 its reverse (11440244112), we get a palindrome (32584448523).

The spelling of 21144204411 in words is "twenty-one billion, one hundred forty-four million, two hundred four thousand, four hundred eleven".