21354540106 has 32 divisors (see below), whose sum is σ = 34365718800. Its totient is φ = 9916563456.

The previous prime is 21354540091. The next prime is 21354540133. The reversal of 21354540106 is 60104545312.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 10280134881 + 11074405225 = 101391^2 + 105235^2 .

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, 1141726 + ... + 1160278.

Almost surely, 2^21354540106 is an apocalyptic number.

21354540106 is a deficient number, since it is larger than the sum of its proper divisors (13011178694).

21354540106 is a wasteful number, since it uses less digits than its factorization.

21354540106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19018.

The product of its (nonzero) digits is 14400, while the sum is 31.

The spelling of 21354540106 in words is "twenty-one billion, three hundred fifty-four million, five hundred forty thousand, one hundred six".