21036823101 has 12 divisors (see below), whose sum is σ = 34727454112. Its totient is φ = 12021041736.

The previous prime is 21036823099. The next prime is 21036823177. The reversal of 21036823101 is 10132863012.

It is a happy number.

It is not a de Polignac number, because 21036823101 - 2¹ = 21036823099 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21036823601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 166958851 + ... + 166958976.

Almost surely, 2^21036823101 is an apocalyptic number.

21036823101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21036823101 is a deficient number, since it is larger than the sum of its proper divisors (13690631011).

21036823101 is a wasteful number, since it uses less digits than its factorization.

21036823101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333917840 (or 333917837 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 21036823101 in words is "twenty-one billion, thirty-six million, eight hundred twenty-three thousand, one hundred one".