21230031210211 has 4 divisors (see below), whose sum is σ = 21803815837552. Its totient is φ = 20656246582872.

The previous prime is 21230031210203. The next prime is 21230031210259. The reversal of 21230031210211 is 11201213003212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21230031210211 - 2³ = 21230031210203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21230031211211) 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 3 ways as a sum of consecutive naturals, for example, 286892313615 + ... + 286892313688.

It is an arithmetic number, because the mean of its divisors is an integer number (5450953959388).

Almost surely, 2^{21230031210211} is an apocalyptic number.

21230031210211 is a deficient number, since it is larger than the sum of its proper divisors (573784627341).

21230031210211 is an equidigital number, since it uses as much as digits as its factorization.

21230031210211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573784627340.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21230031210211 its reverse (11201213003212), we get a palindrome (32431244213423).

The spelling of 21230031210211 in words is "twenty-one trillion, two hundred thirty billion, thirty-one million, two hundred ten thousand, two hundred eleven".