21100012120211 has 4 divisors (see below), whose sum is σ = 21414937674312. Its totient is φ = 20785086566112.

The previous prime is 21100012120181. The next prime is 21100012120261. The reversal of 21100012120211 is 11202121000112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21100012120211 - 2⁴² = 16701965609107 is a prime.

It is a super-2 number, since 2×21100012120211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21100012120261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157462776950 + ... + 157462777083.

It is an arithmetic number, because the mean of its divisors is an integer number (5353734418578).

Almost surely, 2^{21100012120211} is an apocalyptic number.

21100012120211 is a deficient number, since it is larger than the sum of its proper divisors (314925554101).

21100012120211 is an equidigital number, since it uses as much as digits as its factorization.

21100012120211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314925554100.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21100012120211 its reverse (11202121000112), we get a palindrome (32302133120323).

The spelling of 21100012120211 in words is "twenty-one trillion, one hundred billion, twelve million, one hundred twenty thousand, two hundred eleven".