21210231023211 has 16 divisors (see below), whose sum is σ = 28773494497280. Its totient is φ = 13894990309440.

The previous prime is 21210231023197. The next prime is 21210231023231. The reversal of 21210231023211 is 11232013201212.

It is not a de Polignac number, because 21210231023211 - 2⁹ = 21210231022699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210231023231) 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, 178631371 + ... + 178750068.

It is an arithmetic number, because the mean of its divisors is an integer number (1798343406080).

Almost surely, 2^{21210231023211} is an apocalyptic number.

21210231023211 is a deficient number, since it is larger than the sum of its proper divisors (7563263474069).

21210231023211 is a wasteful number, since it uses less digits than its factorization.

21210231023211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357381786.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21210231023211 its reverse (11232013201212), we get a palindrome (32442244224423).

The spelling of 21210231023211 in words is "twenty-one trillion, two hundred ten billion, two hundred thirty-one million, twenty-three thousand, two hundred eleven".