21103356538 has 32 divisors (see below), whose sum is σ = 36625333248. Its totient is φ = 9013056000.

The previous prime is 21103356523. The next prime is 21103356577. The reversal of 21103356538 is 83565330112.

21103356538 is nontrivially palindromic in base 5.

It is a junction number, because it is equal to n+sod(n) for n = 21103356497 and 21103356506.

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, 177831 + ... + 271717.

It is an arithmetic number, because the mean of its divisors is an integer number (1144541664).

Almost surely, 2^21103356538 is an apocalyptic number.

21103356538 is a deficient number, since it is larger than the sum of its proper divisors (15521976710).

21103356538 is a wasteful number, since it uses less digits than its factorization.

21103356538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94518.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 21103356538 in words is "twenty-one billion, one hundred three million, three hundred fifty-six thousand, five hundred thirty-eight".