21736211636 has 12 divisors (see below), whose sum is σ = 38847697728. Its totient is φ = 10636869432.

The previous prime is 21736211621. The next prime is 21736211657. The reversal of 21736211636 is 63611263712.

It is a self number, because there is not a number n which added to its sum of digits gives 21736211636.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57808886 + ... + 57809261.

It is an arithmetic number, because the mean of its divisors is an integer number (3237308144).

Almost surely, 2^21736211636 is an apocalyptic number.

It is an amenable number.

21736211636 is a deficient number, since it is larger than the sum of its proper divisors (17111486092).

21736211636 is a wasteful number, since it uses less digits than its factorization.

21736211636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115618198 (or 115618196 counting only the distinct ones).

The product of its digits is 54432, while the sum is 38.

The spelling of 21736211636 in words is "twenty-one billion, seven hundred thirty-six million, two hundred eleven thousand, six hundred thirty-six".