212013111021 has 4 divisors (see below), whose sum is σ = 282684148032. Its totient is φ = 141342074012.

The previous prime is 212013110989. The next prime is 212013111047. The reversal of 212013111021 is 120111310212.

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 212013111021 - 2⁵ = 212013110989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212013115021) 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, 35335518501 + ... + 35335518506.

It is an arithmetic number, because the mean of its divisors is an integer number (70671037008).

Almost surely, 2^212013111021 is an apocalyptic number.

It is an amenable number.

212013111021 is a deficient number, since it is larger than the sum of its proper divisors (70671037011).

212013111021 is an equidigital number, since it uses as much as digits as its factorization.

212013111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70671037010.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 212013111021 its reverse (120111310212), we get a palindrome (332124421233).

The spelling of 212013111021 in words is "two hundred twelve billion, thirteen million, one hundred eleven thousand, twenty-one".