21110100201 has 10 divisors (see below), whose sum is σ = 31534841162. Its totient is φ = 14073400080.

The previous prime is 21110100169. The next prime is 21110100223. The reversal of 21110100201 is 10200101112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19369958976 + 1740141225 = 139176^2 + 41715^2 .

It is not a de Polignac number, because 21110100201 - 2⁵ = 21110100169 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110104201) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 130309180 + ... + 130309341.

Almost surely, 2^21110100201 is an apocalyptic number.

It is an amenable number.

21110100201 is a deficient number, since it is larger than the sum of its proper divisors (10424740961).

21110100201 is an equidigital number, since it uses as much as digits as its factorization.

21110100201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260618533 (or 260618524 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21110100201 its reverse (10200101112), we get a palindrome (31310201313).

The spelling of 21110100201 in words is "twenty-one billion, one hundred ten million, one hundred thousand, two hundred one".