21211214084 has 6 divisors (see below), whose sum is σ = 37119624654. Its totient is φ = 10605607040.

The previous prime is 21211214083. The next prime is 21211214113. The reversal of 21211214084 is 48041211212.

It can be written as a sum of positive squares in only one way, i.e., 12752733184 + 8458480900 = 112928^2 + 91970^2 .

It is not an unprimeable number, because it can be changed into a prime (21211214083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2651401757 + ... + 2651401764.

It is an arithmetic number, because the mean of its divisors is an integer number (6186604109).

Almost surely, 2^21211214084 is an apocalyptic number.

It is an amenable number.

21211214084 is a deficient number, since it is larger than the sum of its proper divisors (15908410570).

21211214084 is a wasteful number, since it uses less digits than its factorization.

21211214084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5302803525 (or 5302803523 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

Adding to 21211214084 its reverse (48041211212), we get a palindrome (69252425296).

The spelling of 21211214084 in words is "twenty-one billion, two hundred eleven million, two hundred fourteen thousand, eighty-four".