211213230021 has 24 divisors (see below), whose sum is σ = 316723249024. Its totient is φ = 140658392160.

The previous prime is 211213230001. The next prime is 211213230061. The reversal of 211213230021 is 120032312112.

211213230021 is a `hidden beast` number, since 211 + 2 + 132 + 300 + 21 = 666.

211213230021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 211213230021 - 2⁵ = 211213229989 is a prime.

It is a super-2 number, since 2×211213230021² (a number of 23 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 = 211213229976 and 211213230003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211213230001) 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 23 ways as a sum of consecutive naturals, for example, 236125 + ... + 691506.

Almost surely, 2^211213230021 is an apocalyptic number.

It is an amenable number.

211213230021 is a deficient number, since it is larger than the sum of its proper divisors (105510019003).

211213230021 is an frugal number, since it uses more digits than its factorization.

211213230021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928583 (or 928571 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 211213230021 its reverse (120032312112), we get a palindrome (331245542133).

The spelling of 211213230021 in words is "two hundred eleven billion, two hundred thirteen million, two hundred thirty thousand, twenty-one".