20112221101021 has 4 divisors (see below), whose sum is σ = 22985395544032. Its totient is φ = 17239046658012.

The previous prime is 20112221100997. The next prime is 20112221101057. The reversal of 20112221101021 is 12010112221102.

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 a cyclic number.

It is not a de Polignac number, because 20112221101021 - 2⁵ = 20112221100989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20112221100986 and 20112221101004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112221101121) 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, 1436587221495 + ... + 1436587221508.

It is an arithmetic number, because the mean of its divisors is an integer number (5746348886008).

Almost surely, 2^{20112221101021} is an apocalyptic number.

It is an amenable number.

20112221101021 is a deficient number, since it is larger than the sum of its proper divisors (2873174443011).

20112221101021 is an equidigital number, since it uses as much as digits as its factorization.

20112221101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2873174443010.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20112221101021 its reverse (12010112221102), we get a palindrome (32122333322123).

The spelling of 20112221101021 in words is "twenty trillion, one hundred twelve billion, two hundred twenty-one million, one hundred one thousand, twenty-one".