20111010233221 has 4 divisors (see below), whose sum is σ = 20257805928492. Its totient is φ = 19964214537952.

The previous prime is 20111010233191. The next prime is 20111010233263. The reversal of 20111010233221 is 12233201011102.

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 9794483788996 + 10316526444225 = 3129614^2 + 3211935^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111010233221 - 2¹⁵ = 20111010200453 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 (20111011233221) 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, 73397847430 + ... + 73397847703.

It is an arithmetic number, because the mean of its divisors is an integer number (5064451482123).

Almost surely, 2^{20111010233221} is an apocalyptic number.

It is an amenable number.

20111010233221 is a deficient number, since it is larger than the sum of its proper divisors (146795695271).

20111010233221 is a wasteful number, since it uses less digits than its factorization.

20111010233221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146795695270.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 20111010233221 its reverse (12233201011102), we get a palindrome (32344211244323).

The spelling of 20111010233221 in words is "twenty trillion, one hundred eleven billion, ten million, two hundred thirty-three thousand, two hundred twenty-one".