21111210001 has 24 divisors (see below), whose sum is σ = 25197262272. Its totient is φ = 17320368000.

The previous prime is 21111209983. The next prime is 21111210017. The reversal of 21111210001 is 10001211112.

It is not a de Polignac number, because 21111210001 - 2¹⁷ = 21111078929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21111210001.

It is not an unprimeable number, because it can be changed into a prime (21111210401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 606726 + ... + 640576.

It is an arithmetic number, because the mean of its divisors is an integer number (1049885928).

Almost surely, 2^21111210001 is an apocalyptic number.

It is an amenable number.

21111210001 is a deficient number, since it is larger than the sum of its proper divisors (4086052271).

21111210001 is an equidigital number, since it uses as much as digits as its factorization.

21111210001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33993 (or 33952 counting only the distinct ones).

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

Adding to 21111210001 its reverse (10001211112), we get a palindrome (31112421113).

It can be divided in two parts, 211112 and 10001, that multiplied together give a palindrome (2111331112).

The spelling of 21111210001 in words is "twenty-one billion, one hundred eleven million, two hundred ten thousand, one".