21131111212324 has 12 divisors (see below), whose sum is σ = 36979808778864. Its totient is φ = 10565451561224.

The previous prime is 21131111212303. The next prime is 21131111212327. The reversal of 21131111212324 is 42321211113112.

It is a super-2 number, since 2×21131111212324² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21131111212327) 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, 25553374 + ... + 26367349.

It is an arithmetic number, because the mean of its divisors is an integer number (3081650731572).

Almost surely, 2^{21131111212324} is an apocalyptic number.

It is an amenable number.

21131111212324 is a deficient number, since it is larger than the sum of its proper divisors (15848697566540).

21131111212324 is a wasteful number, since it uses less digits than its factorization.

21131111212324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52022474 (or 52022472 counting only the distinct ones).

The product of its digits is 576, while the sum is 25.

Adding to 21131111212324 its reverse (42321211113112), we get a palindrome (63452322325436).

The spelling of 21131111212324 in words is "twenty-one trillion, one hundred thirty-one billion, one hundred eleven million, two hundred twelve thousand, three hundred twenty-four".