21164321413252 has 12 divisors (see below), whose sum is σ = 37050785471196. Its totient is φ = 10578382707200.

The previous prime is 21164321413247. The next prime is 21164321413271. The reversal of 21164321413252 is 25231412346112.

It can be written as a sum of positive squares in 2 ways, for example, as 5477921526016 + 15686399887236 = 2340496^2 + 3960606^2 .

It is a super-2 number, since 2×21164321413252² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

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, 944487253 + ... + 944509660.

It is an arithmetic number, because the mean of its divisors is an integer number (3087565455933).

Almost surely, 2^{21164321413252} is an apocalyptic number.

It is an amenable number.

21164321413252 is a deficient number, since it is larger than the sum of its proper divisors (15886464057944).

21164321413252 is a wasteful number, since it uses less digits than its factorization.

21164321413252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1888999718 (or 1888999716 counting only the distinct ones).

The product of its digits is 69120, while the sum is 37.

Adding to 21164321413252 its reverse (25231412346112), we get a palindrome (46395733759364).

The spelling of 21164321413252 in words is "twenty-one trillion, one hundred sixty-four billion, three hundred twenty-one million, four hundred thirteen thousand, two hundred fifty-two".