21234201172 has 12 divisors (see below), whose sum is σ = 37212268660. Its totient is φ = 10602124416.

The previous prime is 21234201139. The next prime is 21234201187. The reversal of 21234201172 is 27110243212.

It can be written as a sum of positive squares in 2 ways, for example, as 14197675716 + 7036525456 = 119154^2 + 83884^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3740853 + ... + 3746524.

Almost surely, 2^21234201172 is an apocalyptic number.

It is an amenable number.

21234201172 is a deficient number, since it is larger than the sum of its proper divisors (15978067488).

21234201172 is a wasteful number, since it uses less digits than its factorization.

21234201172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7488090 (or 7488088 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

Adding to 21234201172 its reverse (27110243212), we get a palindrome (48344444384).

The spelling of 21234201172 in words is "twenty-one billion, two hundred thirty-four million, two hundred one thousand, one hundred seventy-two".