212120021111001 has 4 divisors (see below), whose sum is σ = 282826694814672. Its totient is φ = 141413347407332.

The previous prime is 212120021110973. The next prime is 212120021111071. The reversal of 212120021111001 is 100111120021212.

It is a happy number.

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 212120021111001 - 2²⁹ = 212119484240089 is a prime.

It is a super-2 number, since 2×212120021111001² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212120021111071) 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, 35353336851831 + ... + 35353336851836.

It is an arithmetic number, because the mean of its divisors is an integer number (70706673703668).

Almost surely, 2^{212120021111001} is an apocalyptic number.

It is an amenable number.

212120021111001 is a deficient number, since it is larger than the sum of its proper divisors (70706673703671).

212120021111001 is an equidigital number, since it uses as much as digits as its factorization.

212120021111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70706673703670.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 212120021111001 its reverse (100111120021212), we get a palindrome (312231141132213).

The spelling of 212120021111001 in words is "two hundred twelve trillion, one hundred twenty billion, twenty-one million, one hundred eleven thousand, one".