21365555235602 has 4 divisors (see below), whose sum is σ = 32048332853406. Its totient is φ = 10682777617800.

The previous prime is 21365555235601. The next prime is 21365555235659. The reversal of 21365555235602 is 20653255556312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12718773862921 + 8646781372681 = 3566339^2 + 2940541^2 .

It is not an unprimeable number, because it can be changed into a prime (21365555235601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5341388808899 + ... + 5341388808902.

Almost surely, 2^{21365555235602} is an apocalyptic number.

21365555235602 is a deficient number, since it is larger than the sum of its proper divisors (10682777617804).

21365555235602 is a wasteful number, since it uses less digits than its factorization.

21365555235602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10682777617803.

The product of its (nonzero) digits is 8100000, while the sum is 50.

The spelling of 21365555235602 in words is "twenty-one trillion, three hundred sixty-five billion, five hundred fifty-five million, two hundred thirty-five thousand, six hundred two".