21113404545 has 16 divisors (see below), whose sum is σ = 34257244032. Its totient is φ = 11101883520.

The previous prime is 21113404483. The next prime is 21113404589. The reversal of 21113404545 is 54540431112.

It is not a de Polignac number, because 21113404545 - 2⁹ = 21113404033 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9911332 + ... + 9913461.

It is an arithmetic number, because the mean of its divisors is an integer number (2141077752).

Almost surely, 2^21113404545 is an apocalyptic number.

It is an amenable number.

21113404545 is a deficient number, since it is larger than the sum of its proper divisors (13143839487).

21113404545 is a wasteful number, since it uses less digits than its factorization.

21113404545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19824872.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 21113404545 its reverse (54540431112), we get a palindrome (75653835657).

The spelling of 21113404545 in words is "twenty-one billion, one hundred thirteen million, four hundred four thousand, five hundred forty-five".