21365622516352 has 16 divisors (see below), whose sum is σ = 42564326107050. Its totient is φ = 10682811258112.

The previous prime is 21365622516283. The next prime is 21365622516467. The reversal of 21365622516352 is 25361522656312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15604585669696 + 5761036846656 = 3950264^2 + 2400216^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×21365622516352² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21365622516296 and 21365622516305.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83459462827 + ... + 83459463082.

Almost surely, 2^{21365622516352} is an apocalyptic number.

It is an amenable number.

21365622516352 is a deficient number, since it is larger than the sum of its proper divisors (21198703590698).

21365622516352 is an equidigital number, since it uses as much as digits as its factorization.

21365622516352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166918925923 (or 166918925911 counting only the distinct ones).

The product of its digits is 3888000, while the sum is 49.

The spelling of 21365622516352 in words is "twenty-one trillion, three hundred sixty-five billion, six hundred twenty-two million, five hundred sixteen thousand, three hundred fifty-two".