21054352105 has 32 divisors (see below), whose sum is σ = 26797962240. Its totient is φ = 15879656448.

The previous prime is 21054352097. The next prime is 21054352127. The reversal of 21054352105 is 50125345012.

It is not a de Polignac number, because 21054352105 - 2³ = 21054352097 is a prime.

It is a super-2 number, since 2×21054352105² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7646409 + ... + 7649161.

It is an arithmetic number, because the mean of its divisors is an integer number (837436320).

Almost surely, 2^21054352105 is an apocalyptic number.

It is an amenable number.

21054352105 is a deficient number, since it is larger than the sum of its proper divisors (5743610135).

21054352105 is an equidigital number, since it uses as much as digits as its factorization.

21054352105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3038 (or 3000 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

Adding to 21054352105 its reverse (50125345012), we get a palindrome (71179697117).

The spelling of 21054352105 in words is "twenty-one billion, fifty-four million, three hundred fifty-two thousand, one hundred five".