21151010172202 has 8 divisors (see below), whose sum is σ = 31726914667812. Its totient is φ = 10575371949600.

The previous prime is 21151010172197. The next prime is 21151010172209. The reversal of 21151010172202 is 20227101015112.

It can be written as a sum of positive squares in 2 ways, for example, as 19268052632521 + 1882957539681 = 4389539^2 + 1372209^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21151010172209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66369549 + ... + 66687472.

Almost surely, 2^{21151010172202} is an apocalyptic number.

21151010172202 is a deficient number, since it is larger than the sum of its proper divisors (10575904495610).

21151010172202 is a wasteful number, since it uses less digits than its factorization.

21151010172202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133136504.

The product of its (nonzero) digits is 560, while the sum is 25.

Adding to 21151010172202 its reverse (20227101015112), we get a palindrome (41378111187314).

The spelling of 21151010172202 in words is "twenty-one trillion, one hundred fifty-one billion, ten million, one hundred seventy-two thousand, two hundred two".