211020331021 has 8 divisors (see below), whose sum is σ = 212106610584. Its totient is φ = 209934204480.

The previous prime is 211020331007. The next prime is 211020331051. The reversal of 211020331021 is 120133020112.

It can be written as a sum of positive squares in 4 ways, for example, as 29020826025 + 181999504996 = 170355^2 + 426614^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211020331021 - 2⁷ = 211020330893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211020330986 and 211020331004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211020331001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3623691 + ... + 3681463.

It is an arithmetic number, because the mean of its divisors is an integer number (26513326323).

Almost surely, 2^211020331021 is an apocalyptic number.

It is an amenable number.

211020331021 is a deficient number, since it is larger than the sum of its proper divisors (1086279563).

211020331021 is a wasteful number, since it uses less digits than its factorization.

211020331021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76511.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 211020331021 its reverse (120133020112), we get a palindrome (331153351133).

The spelling of 211020331021 in words is "two hundred eleven billion, twenty million, three hundred thirty-one thousand, twenty-one".