211020311021 has 32 divisors (see below), whose sum is σ = 251519318400. Its totient is φ = 175251444480.

The previous prime is 211020310993. The next prime is 211020311023. The reversal of 211020311021 is 120113020112.

211020311021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211020311021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211020310987 and 211020311005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211020311023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 195470 + ... + 678416.

It is an arithmetic number, because the mean of its divisors is an integer number (7859978700).

Almost surely, 2^211020311021 is an apocalyptic number.

It is an amenable number.

211020311021 is a deficient number, since it is larger than the sum of its proper divisors (40499007379).

211020311021 is a wasteful number, since it uses less digits than its factorization.

211020311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483069.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 211020311021 its reverse (120113020112), we get a palindrome (331133331133).

The spelling of 211020311021 in words is "two hundred eleven billion, twenty million, three hundred eleven thousand, twenty-one".