21354540105 has 16 divisors (see below), whose sum is σ = 34199492544. Its totient is φ = 11378345280.

The previous prime is 21354540091. The next prime is 21354540133. The reversal of 21354540105 is 50104545312.

It is not a de Polignac number, because 21354540105 - 2¹⁵ = 21354507337 is a prime.

It is a super-2 number, since 2×21354540105² (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 (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 654979 + ... + 686808.

It is an arithmetic number, because the mean of its divisors is an integer number (2137468284).

Almost surely, 2^21354540105 is an apocalyptic number.

It is an amenable number.

21354540105 is a deficient number, since it is larger than the sum of its proper divisors (12844952439).

21354540105 is a wasteful number, since it uses less digits than its factorization.

21354540105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1342856.

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 21354540105 in words is "twenty-one billion, three hundred fifty-four million, five hundred forty thousand, one hundred five".