20021102112221 has 4 divisors (see below), whose sum is σ = 22881259556832. Its totient is φ = 17160944667612.

The previous prime is 20021102112131. The next prime is 20021102112343. The reversal of 20021102112221 is 12221120112002.

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 20021102112221 - 2²⁶ = 20021035003357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20021102112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021102112821) 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, 1430078722295 + ... + 1430078722308.

It is an arithmetic number, because the mean of its divisors is an integer number (5720314889208).

Almost surely, 2^{20021102112221} is an apocalyptic number.

It is an amenable number.

20021102112221 is a deficient number, since it is larger than the sum of its proper divisors (2860157444611).

20021102112221 is an equidigital number, since it uses as much as digits as its factorization.

20021102112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2860157444610.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20021102112221 its reverse (12221120112002), we get a palindrome (32242222224223).

The spelling of 20021102112221 in words is "twenty trillion, twenty-one billion, one hundred two million, one hundred twelve thousand, two hundred twenty-one".