21211022176 has 12 divisors (see below), whose sum is σ = 41759199972. Its totient is φ = 10605511072.

The previous prime is 21211022171. The next prime is 21211022177. The reversal of 21211022176 is 67122011212.

It is a self number, because there is not a number n which added to its sum of digits gives 21211022176.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211022171) 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, 331422190 + ... + 331422253.

It is an arithmetic number, because the mean of its divisors is an integer number (3479933331).

Almost surely, 2^21211022176 is an apocalyptic number.

It is an amenable number.

21211022176 is a deficient number, since it is larger than the sum of its proper divisors (20548177796).

21211022176 is an equidigital number, since it uses as much as digits as its factorization.

21211022176 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662844453 (or 662844445 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 25.

Adding to 21211022176 its reverse (67122011212), we get a palindrome (88333033388).

The spelling of 21211022176 in words is "twenty-one billion, two hundred eleven million, twenty-two thousand, one hundred seventy-six".