21088303361 has 4 divisors (see below), whose sum is σ = 22328791812. Its totient is φ = 19847814912.

The previous prime is 21088303321. The next prime is 21088303373. The reversal of 21088303361 is 16330388012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14037510400 + 7050792961 = 118480^2 + 83969^2 .

It is a cyclic number.

It is not a de Polignac number, because 21088303361 - 2⁶ = 21088303297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21088303321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620244200 + ... + 620244233.

It is an arithmetic number, because the mean of its divisors is an integer number (5582197953).

Almost surely, 2^21088303361 is an apocalyptic number.

It is an amenable number.

21088303361 is a deficient number, since it is larger than the sum of its proper divisors (1240488451).

21088303361 is a wasteful number, since it uses less digits than its factorization.

21088303361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240488450.

The product of its (nonzero) digits is 20736, while the sum is 35.

The spelling of 21088303361 in words is "twenty-one billion, eighty-eight million, three hundred three thousand, three hundred sixty-one".