21304252254052 has 6 divisors (see below), whose sum is σ = 37282441444598. Its totient is φ = 10652126127024.

The previous prime is 21304252254007. The next prime is 21304252254053. The reversal of 21304252254052 is 25045225240312.

It can be written as a sum of positive squares in only one way, i.e., 21304003371876 + 248882176 = 4615626^2 + 15776^2 .

It is not an unprimeable number, because it can be changed into a prime (21304252254053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2663031531753 + ... + 2663031531760.

Almost surely, 2^{21304252254052} is an apocalyptic number.

It is an amenable number.

21304252254052 is a deficient number, since it is larger than the sum of its proper divisors (15978189190546).

21304252254052 is a wasteful number, since it uses less digits than its factorization.

21304252254052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5326063063517 (or 5326063063515 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 37.

Adding to 21304252254052 its reverse (25045225240312), we get a palindrome (46349477494364).

The spelling of 21304252254052 in words is "twenty-one trillion, three hundred four billion, two hundred fifty-two million, two hundred fifty-four thousand, fifty-two".