21201110109983 has 4 divisors (see below), whose sum is σ = 21202206757368. Its totient is φ = 21200013462600.

The previous prime is 21201110109943. The next prime is 21201110110007. The reversal of 21201110109983 is 38990101110212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21201110109983 - 2¹⁸ = 21201109847839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201110109943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 548294693 + ... + 548333358.

It is an arithmetic number, because the mean of its divisors is an integer number (5300551689342).

Almost surely, 2^{21201110109983} is an apocalyptic number.

21201110109983 is a deficient number, since it is larger than the sum of its proper divisors (1096647385).

21201110109983 is a wasteful number, since it uses less digits than its factorization.

21201110109983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096647384.

The product of its (nonzero) digits is 7776, while the sum is 38.

The spelling of 21201110109983 in words is "twenty-one trillion, two hundred one billion, one hundred ten million, one hundred nine thousand, nine hundred eighty-three".