212100121020011 has 4 divisors (see below), whose sum is σ = 242400138308592. Its totient is φ = 181800103731432.

The previous prime is 212100121019993. The next prime is 212100121020013. The reversal of 212100121020011 is 110020121001212.

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 212100121020011 - 2²⁶ = 212100053911147 is a prime.

It is a super-2 number, since 2×212100121020011² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212100121020013) 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, 15150008644280 + ... + 15150008644293.

It is an arithmetic number, because the mean of its divisors is an integer number (60600034577148).

Almost surely, 2^{212100121020011} is an apocalyptic number.

212100121020011 is a deficient number, since it is larger than the sum of its proper divisors (30300017288581).

212100121020011 is an equidigital number, since it uses as much as digits as its factorization.

212100121020011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30300017288580.

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

Adding to 212100121020011 its reverse (110020121001212), we get a palindrome (322120242021223).

The spelling of 212100121020011 in words is "two hundred twelve trillion, one hundred billion, one hundred twenty-one million, twenty thousand, eleven".