211210011021 has 4 divisors (see below), whose sum is σ = 281613348032. Its totient is φ = 140806674012.

The previous prime is 211210011013. The next prime is 211210011113. The reversal of 211210011021 is 120110012112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 211210011021 - 2³ = 211210011013 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 = 211210010988 and 211210011006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211210011121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35201668501 + ... + 35201668506.

It is an arithmetic number, because the mean of its divisors is an integer number (70403337008).

Almost surely, 2^211210011021 is an apocalyptic number.

It is an amenable number.

211210011021 is a deficient number, since it is larger than the sum of its proper divisors (70403337011).

211210011021 is an equidigital number, since it uses as much as digits as its factorization.

211210011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70403337010.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 211210011021 its reverse (120110012112), we get a palindrome (331320023133).

The spelling of 211210011021 in words is "two hundred eleven billion, two hundred ten million, eleven thousand, twenty-one".