211020030021 has 8 divisors (see below), whose sum is σ = 281528626720. Its totient is φ = 140595726672.

The previous prime is 211020030017. The next prime is 211020030043. The reversal of 211020030021 is 120030020112.

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

It is not a de Polignac number, because 211020030021 - 2² = 211020030017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211020029979 and 211020030006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211020030721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21067495 + ... + 21077508.

It is an arithmetic number, because the mean of its divisors is an integer number (35191078340).

Almost surely, 2^211020030021 is an apocalyptic number.

It is an amenable number.

211020030021 is a deficient number, since it is larger than the sum of its proper divisors (70508596699).

211020030021 is a wasteful number, since it uses less digits than its factorization.

211020030021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42146675.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 211020030021 its reverse (120030020112), we get a palindrome (331050050133).

Subtracting from 211020030021 its reverse (120030020112), we obtain a palindrome (90990009909).

The spelling of 211020030021 in words is "two hundred eleven billion, twenty million, thirty thousand, twenty-one".