212011100001021 has 4 divisors (see below), whose sum is σ = 282681466668032. Its totient is φ = 141340733334012.

The previous prime is 212011100001011. The next prime is 212011100001023. The reversal of 212011100001021 is 120100001110212.

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 not a de Polignac number, because 212011100001021 - 2¹⁰ = 212011099999997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212011100000988 and 212011100001006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212011100001023) 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, 35335183333501 + ... + 35335183333506.

It is an arithmetic number, because the mean of its divisors is an integer number (70670366667008).

Almost surely, 2^{212011100001021} is an apocalyptic number.

It is an amenable number.

212011100001021 is a deficient number, since it is larger than the sum of its proper divisors (70670366667011).

212011100001021 is an equidigital number, since it uses as much as digits as its factorization.

212011100001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70670366667010.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 212011100001021 its reverse (120100001110212), we get a palindrome (332111101111233).

The spelling of 212011100001021 in words is "two hundred twelve trillion, eleven billion, one hundred million, one thousand, twenty-one".