21210131311 has 8 divisors (see below), whose sum is σ = 22474072944. Its totient is φ = 19947999360.

The previous prime is 21210131303. The next prime is 21210131317. The reversal of 21210131311 is 11313101212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21210131311 - 2³ = 21210131303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210131317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 428245 + ... + 475198.

It is an arithmetic number, because the mean of its divisors is an integer number (2809259118).

Almost surely, 2^21210131311 is an apocalyptic number.

21210131311 is a deficient number, since it is larger than the sum of its proper divisors (1263941633).

21210131311 is a wasteful number, since it uses less digits than its factorization.

21210131311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904841.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21210131311 its reverse (11313101212), we get a palindrome (32523232523).

The spelling of 21210131311 in words is "twenty-one billion, two hundred ten million, one hundred thirty-one thousand, three hundred eleven".