21131304214 has 16 divisors (see below), whose sum is σ = 33369551280. Its totient is φ = 10008264960.

The previous prime is 21131304151. The next prime is 21131304221. The reversal of 21131304214 is 41240313112.

It is a super-2 number, since 2×21131304214² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301182 + ... + 364654.

It is an arithmetic number, because the mean of its divisors is an integer number (2085596955).

Almost surely, 2^21131304214 is an apocalyptic number.

21131304214 is a deficient number, since it is larger than the sum of its proper divisors (12238247066).

21131304214 is a wasteful number, since it uses less digits than its factorization.

21131304214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72255.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21131304214 its reverse (41240313112), we get a palindrome (62371617326).

The spelling of 21131304214 in words is "twenty-one billion, one hundred thirty-one million, three hundred four thousand, two hundred fourteen".