211102012021 has 6 divisors (see below), whose sum is σ = 224250234530. Its totient is φ = 198684246336.

The previous prime is 211102012007. The next prime is 211102012049. The reversal of 211102012021 is 120210201112.

It can be written as a sum of positive squares in 3 ways, for example, as 60228031396 + 150873980625 = 245414^2 + 388425^2 .

It is not a de Polignac number, because 211102012021 - 2²¹ = 211099914869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211102011992 and 211102012010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211102012081) 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 5 ways as a sum of consecutive naturals, for example, 365228106 + ... + 365228683.

Almost surely, 2^211102012021 is an apocalyptic number.

It is an amenable number.

211102012021 is a deficient number, since it is larger than the sum of its proper divisors (13148222509).

211102012021 is an equidigital number, since it uses as much as digits as its factorization.

211102012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730456823 (or 730456806 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 211102012021 its reverse (120210201112), we get a palindrome (331312213133).

The spelling of 211102012021 in words is "two hundred eleven billion, one hundred two million, twelve thousand, twenty-one".