211121210010001 has 4 divisors (see below), whose sum is σ = 211188855386404. Its totient is φ = 211053564633600.

The previous prime is 211121210009993. The next prime is 211121210010023. The reversal of 211121210010001 is 100010012121112.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 91676507796225 + 119444702213776 = 9574785^2 + 10929076^2 .

It is a cyclic number.

It is not a de Polignac number, because 211121210010001 - 2³ = 211121210009993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211121210010401) 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, 33822683520 + ... + 33822689761.

It is an arithmetic number, because the mean of its divisors is an integer number (52797213846601).

Almost surely, 2^{211121210010001} is an apocalyptic number.

It is an amenable number.

211121210010001 is a deficient number, since it is larger than the sum of its proper divisors (67645376403).

211121210010001 is an equidigital number, since it uses as much as digits as its factorization.

211121210010001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67645376402.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 211121210010001 its reverse (100010012121112), we get a palindrome (311131222131113).

The spelling of 211121210010001 in words is "two hundred eleven trillion, one hundred twenty-one billion, two hundred ten million, ten thousand, one".