21111100201 has 4 divisors (see below), whose sum is σ = 21160082304. Its totient is φ = 21062118100.

The previous prime is 21111100181. The next prime is 21111100289. The reversal of 21111100201 is 10200111112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21111100201 - 2²⁷ = 20976882473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111100001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24490405 + ... + 24491266.

It is an arithmetic number, because the mean of its divisors is an integer number (5290020576).

Almost surely, 2^21111100201 is an apocalyptic number.

It is an amenable number.

21111100201 is a deficient number, since it is larger than the sum of its proper divisors (48982103).

21111100201 is an equidigital number, since it uses as much as digits as its factorization.

21111100201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48982102.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21111100201 its reverse (10200111112), we get a palindrome (31311211313).

The spelling of 21111100201 in words is "twenty-one billion, one hundred eleven million, one hundred thousand, two hundred one".