21054430011 has 24 divisors (see below), whose sum is σ = 29952688320. Its totient is φ = 13152303232.

The previous prime is 21054430009. The next prime is 21054430037. The reversal of 21054430011 is 11003445012.

It is not a de Polignac number, because 21054430011 - 2¹ = 21054430009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21054430011.

It is not an unprimeable number, because it can be changed into a prime (21054430711) 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, 143320 + ... + 250298.

It is an arithmetic number, because the mean of its divisors is an integer number (1248028680).

Almost surely, 2^21054430011 is an apocalyptic number.

21054430011 is a deficient number, since it is larger than the sum of its proper divisors (8898258309).

21054430011 is a wasteful number, since it uses less digits than its factorization.

21054430011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107243 (or 107226 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21054430011 its reverse (11003445012), we get a palindrome (32057875023).

The spelling of 21054430011 in words is "twenty-one billion, fifty-four million, four hundred thirty thousand, eleven".