21040252204634 has 8 divisors (see below), whose sum is σ = 33988099715220. Its totient is φ = 9710885632896.

The previous prime is 21040252204627. The next prime is 21040252204661. The reversal of 21040252204634 is 43640225204012.

It can be written as a sum of positive squares in 2 ways, for example, as 19359093610609 + 1681158594025 = 4399897^2 + 1296595^2 .

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

It is a super-2 number, since 2×21040252204634² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21040252204594 and 21040252204603.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404620234679 + ... + 404620234730.

Almost surely, 2^{21040252204634} is an apocalyptic number.

21040252204634 is a deficient number, since it is larger than the sum of its proper divisors (12947847510586).

21040252204634 is a wasteful number, since it uses less digits than its factorization.

21040252204634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809240469424.

The product of its (nonzero) digits is 92160, while the sum is 35.

Adding to 21040252204634 its reverse (43640225204012), we get a palindrome (64680477408646).

The spelling of 21040252204634 in words is "twenty-one trillion, forty billion, two hundred fifty-two million, two hundred four thousand, six hundred thirty-four".