21000013352 has 16 divisors (see below), whose sum is σ = 39381557940. Its totient is φ = 10498264576.

The previous prime is 21000013343. The next prime is 21000013367. The reversal of 21000013352 is 25331000012.

It can be written as a sum of positive squares in 2 ways, for example, as 20693973316 + 306040036 = 143854^2 + 17494^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21000013352.

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, 165803 + ... + 263610.

Almost surely, 2^21000013352 is an apocalyptic number.

It is an amenable number.

21000013352 is a deficient number, since it is larger than the sum of its proper divisors (18381544588).

21000013352 is a wasteful number, since it uses less digits than its factorization.

21000013352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435532 (or 435528 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

Adding to 21000013352 its reverse (25331000012), we get a palindrome (46331013364).

The spelling of 21000013352 in words is "twenty-one billion, thirteen thousand, three hundred fifty-two".