20859286221 has 6 divisors (see below), whose sum is σ = 30130080110. Its totient is φ = 13906190808.

The previous prime is 20859286213. The next prime is 20859286223. The reversal of 20859286221 is 12268295802.

It can be written as a sum of positive squares in only one way, i.e., 20199515625 + 659770596 = 142125^2 + 25686^2 .

It is not a de Polignac number, because 20859286221 - 2³ = 20859286213 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 (20859286223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1158849226 + ... + 1158849243.

Almost surely, 2^20859286221 is an apocalyptic number.

It is an amenable number.

20859286221 is a deficient number, since it is larger than the sum of its proper divisors (9270793889).

20859286221 is a wasteful number, since it uses less digits than its factorization.

20859286221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2317698475 (or 2317698472 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 20859286221 in words is "twenty billion, eight hundred fifty-nine million, two hundred eighty-six thousand, two hundred twenty-one".