21311213210211 has 16 divisors (see below), whose sum is σ = 28619911716480. Its totient is φ = 14104998922560.

The previous prime is 21311213210153. The next prime is 21311213210219. The reversal of 21311213210211 is 11201231211312.

It is not a de Polignac number, because 21311213210211 - 2⁷ = 21311213210083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21311213210219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23185156 + ... + 24086798.

It is an arithmetic number, because the mean of its divisors is an integer number (1788744482280).

Almost surely, 2^{21311213210211} is an apocalyptic number.

21311213210211 is a deficient number, since it is larger than the sum of its proper divisors (7308698506269).

21311213210211 is a wasteful number, since it uses less digits than its factorization.

21311213210211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 958466.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 21311213210211 its reverse (11201231211312), we get a palindrome (32512444421523).

The spelling of 21311213210211 in words is "twenty-one trillion, three hundred eleven billion, two hundred thirteen million, two hundred ten thousand, two hundred eleven".