212100011011021 has 4 divisors (see below), whose sum is σ = 242400012584032. Its totient is φ = 181800009438012.

The previous prime is 212100011011019. The next prime is 212100011011061. The reversal of 212100011011021 is 120110110001212.

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 not a de Polignac number, because 212100011011021 - 2¹ = 212100011011019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212100011010992 and 212100011011010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212100011011061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15150000786495 + ... + 15150000786508.

It is an arithmetic number, because the mean of its divisors is an integer number (60600003146008).

Almost surely, 2^{212100011011021} is an apocalyptic number.

It is an amenable number.

212100011011021 is a deficient number, since it is larger than the sum of its proper divisors (30300001573011).

212100011011021 is an equidigital number, since it uses as much as digits as its factorization.

212100011011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30300001573010.

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

Adding to 212100011011021 its reverse (120110110001212), we get a palindrome (332210121012233).

The spelling of 212100011011021 in words is "two hundred twelve trillion, one hundred billion, eleven million, eleven thousand, twenty-one".