21131011213110 has 64 divisors (see below), whose sum is σ = 56722537935360. Its totient is φ = 5597618853600.

The previous prime is 21131011213049. The next prime is 21131011213129. The reversal of 21131011213110 is 1131211013112.

21131011213110 is a `hidden beast` number, since 2 + 11 + 310 + 11 + 21 + 311 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 259108252 + ... + 259189791.

It is an arithmetic number, because the mean of its divisors is an integer number (886289655240).

Almost surely, 2^{21131011213110} is an apocalyptic number.

21131011213110 is an abundant number, since it is smaller than the sum of its proper divisors (35591526722250).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21131011213110 is a wasteful number, since it uses less digits than its factorization.

21131011213110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518298210 (or 518298204 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

Adding to 21131011213110 its reverse (1131211013112), we get a palindrome (22262222226222).

The spelling of 21131011213110 in words is "twenty-one trillion, one hundred thirty-one billion, eleven million, two hundred thirteen thousand, one hundred ten".