20998316361 has 8 divisors (see below), whose sum is σ = 30543005664. Its totient is φ = 12726252320.

The previous prime is 20998316359. The next prime is 20998316363. The reversal of 20998316361 is 16361389902.

It is an interprime number because it is at equal distance from previous prime (20998316359) and next prime (20998316363).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20998316361 - 2¹ = 20998316359 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20998316361.

It is not an unprimeable number, because it can be changed into a prime (20998316363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318156276 + ... + 318156341.

It is an arithmetic number, because the mean of its divisors is an integer number (3817875708).

Almost surely, 2^20998316361 is an apocalyptic number.

It is an amenable number.

20998316361 is a deficient number, since it is larger than the sum of its proper divisors (9544689303).

20998316361 is a wasteful number, since it uses less digits than its factorization.

20998316361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636312631.

The product of its (nonzero) digits is 419904, while the sum is 48.

The spelling of 20998316361 in words is "twenty billion, nine hundred ninety-eight million, three hundred sixteen thousand, three hundred sixty-one".