20964421173 has 4 divisors (see below), whose sum is σ = 27952561568. Its totient is φ = 13976280780.

The previous prime is 20964421171. The next prime is 20964421193. The reversal of 20964421173 is 37112446902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20964421173 - 2¹ = 20964421171 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20964421171) 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, 3494070193 + ... + 3494070198.

It is an arithmetic number, because the mean of its divisors is an integer number (6988140392).

Almost surely, 2^20964421173 is an apocalyptic number.

It is an amenable number.

20964421173 is a deficient number, since it is larger than the sum of its proper divisors (6988140395).

20964421173 is an equidigital number, since it uses as much as digits as its factorization.

20964421173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6988140394.

The product of its (nonzero) digits is 72576, while the sum is 39.

The spelling of 20964421173 in words is "twenty billion, nine hundred sixty-four million, four hundred twenty-one thousand, one hundred seventy-three".