21110020201 has 8 divisors (see below), whose sum is σ = 21321983304. Its totient is φ = 20898115200.

The previous prime is 21110020159. The next prime is 21110020231. The reversal of 21110020201 is 10202001112.

It can be written as a sum of positive squares in 4 ways, for example, as 9250592400 + 11859427801 = 96180^2 + 108901^2 .

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 21110020201 - 2⁷ = 21110020073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110020231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1381861 + ... + 1397053.

It is an arithmetic number, because the mean of its divisors is an integer number (2665247913).

Almost surely, 2^21110020201 is an apocalyptic number.

It is an amenable number.

21110020201 is a deficient number, since it is larger than the sum of its proper divisors (211963103).

21110020201 is a wasteful number, since it uses less digits than its factorization.

21110020201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29051.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21110020201 its reverse (10202001112), we get a palindrome (31312021313).

The spelling of 21110020201 in words is "twenty-one billion, one hundred ten million, twenty thousand, two hundred one".