212011110211021 has 4 divisors (see below), whose sum is σ = 231284847502944. Its totient is φ = 192737372919100.

The previous prime is 212011110211003. The next prime is 212011110211031. The reversal of 212011110211021 is 120112011110212.

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 a de Polignac number, because none of the positive numbers 2^k-212011110211021 is a prime.

It is a super-2 number, since 2×212011110211021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212011110210986 and 212011110211004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212011110211031) 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, 9636868645945 + ... + 9636868645966.

It is an arithmetic number, because the mean of its divisors is an integer number (57821211875736).

Almost surely, 2^{212011110211021} is an apocalyptic number.

It is an amenable number.

212011110211021 is a deficient number, since it is larger than the sum of its proper divisors (19273737291923).

212011110211021 is a wasteful number, since it uses less digits than its factorization.

212011110211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19273737291922.

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

Adding to 212011110211021 its reverse (120112011110212), we get a palindrome (332123121321233).

The spelling of 212011110211021 in words is "two hundred twelve trillion, eleven billion, one hundred ten million, two hundred eleven thousand, twenty-one".