20998010164907 has 4 divisors (see below), whose sum is σ = 20998074911616. Its totient is φ = 20997945418200.

The previous prime is 20998010164777. The next prime is 20998010164931. The reversal of 20998010164907 is 70946101089902.

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

It is a cyclic number.

It is not a de Polignac number, because 20998010164907 - 2¹⁴ = 20998010148523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20998010161907) 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, 31884428 + ... + 32536329.

It is an arithmetic number, because the mean of its divisors is an integer number (5249518727904).

Almost surely, 2^{20998010164907} is an apocalyptic number.

20998010164907 is a deficient number, since it is larger than the sum of its proper divisors (64746709).

20998010164907 is an equidigital number, since it uses as much as digits as its factorization.

20998010164907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64746708.

The product of its (nonzero) digits is 1959552, while the sum is 56.

The spelling of 20998010164907 in words is "twenty trillion, nine hundred ninety-eight billion, ten million, one hundred sixty-four thousand, nine hundred seven".