20081835221 has 8 divisors (see below), whose sum is σ = 23165161920. Its totient is φ = 17052131808.

The previous prime is 20081835181. The next prime is 20081835229. The reversal of 20081835221 is 12253818002.

It is a happy number.

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 20081835221 - 2²⁶ = 20014726357 is a prime.

It is a super-2 number, since 2×20081835221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20081835229) 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, 13405016 + ... + 13406513.

It is an arithmetic number, because the mean of its divisors is an integer number (2895645240).

Almost surely, 2^20081835221 is an apocalyptic number.

It is an amenable number.

20081835221 is a deficient number, since it is larger than the sum of its proper divisors (3083326699).

20081835221 is a wasteful number, since it uses less digits than its factorization.

20081835221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26811643.

The product of its (nonzero) digits is 7680, while the sum is 32.

The spelling of 20081835221 in words is "twenty billion, eighty-one million, eight hundred thirty-five thousand, two hundred twenty-one".