20960922421 has 4 divisors (see below), whose sum is σ = 20982377772. Its totient is φ = 20939467072.

The previous prime is 20960922377. The next prime is 20960922443. The reversal of 20960922421 is 12422906902.

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 13435359921 + 7525562500 = 115911^2 + 86750^2 .

It is a cyclic number.

It is not a de Polignac number, because 20960922421 - 2¹¹ = 20960920373 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 (20960922461) 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, 10726210 + ... + 10728163.

It is an arithmetic number, because the mean of its divisors is an integer number (5245594443).

Almost surely, 2^20960922421 is an apocalyptic number.

It is an amenable number.

20960922421 is a deficient number, since it is larger than the sum of its proper divisors (21455351).

20960922421 is an equidigital number, since it uses as much as digits as its factorization.

20960922421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21455350.

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 20960922421 in words is "twenty billion, nine hundred sixty million, nine hundred twenty-two thousand, four hundred twenty-one".