21031202310211 has 4 divisors (see below), whose sum is σ = 21097546797312. Its totient is φ = 20964857823112.

The previous prime is 21031202310191. The next prime is 21031202310221. The reversal of 21031202310211 is 11201320213012.

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 21031202310211 - 2¹⁵ = 21031202277443 is a prime.

It is a super-2 number, since 2×21031202310211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21031202310221) 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, 33172243075 + ... + 33172243708.

It is an arithmetic number, because the mean of its divisors is an integer number (5274386699328).

Almost surely, 2^{21031202310211} is an apocalyptic number.

21031202310211 is a deficient number, since it is larger than the sum of its proper divisors (66344487101).

21031202310211 is an equidigital number, since it uses as much as digits as its factorization.

21031202310211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66344487100.

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

Adding to 21031202310211 its reverse (11201320213012), we get a palindrome (32232522523223).

The spelling of 21031202310211 in words is "twenty-one trillion, thirty-one billion, two hundred two million, three hundred ten thousand, two hundred eleven".