21201110023 has 8 divisors (see below), whose sum is σ = 22564549728. Its totient is φ = 19850594304.

The previous prime is 21201109961. The next prime is 21201110027. The reversal of 21201110023 is 32001110212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21201110023 - 2²¹ = 21199012871 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21201109985 and 21201110012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201110027) 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 7 ways as a sum of consecutive naturals, for example, 3227611 + ... + 3234172.

It is an arithmetic number, because the mean of its divisors is an integer number (2820568716).

Almost surely, 2^21201110023 is an apocalyptic number.

21201110023 is a deficient number, since it is larger than the sum of its proper divisors (1363439705).

21201110023 is a wasteful number, since it uses less digits than its factorization.

21201110023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6461993.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21201110023 its reverse (32001110212), we get a palindrome (53202220235).

The spelling of 21201110023 in words is "twenty-one billion, two hundred one million, one hundred ten thousand, twenty-three".