20200112221021 has 2 divisors, whose sum is σ = 20200112221022. Its totient is φ = 20200112221020.

The previous prime is 20200112220979. The next prime is 20200112221057. The reversal of 20200112221021 is 12012221100202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17766477900900 + 2433634320121 = 4215030^2 + 1560011^2 .

It is a cyclic number.

It is not a de Polignac number, because 20200112221021 - 2²⁵ = 20200078666589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20200112220986 and 20200112221004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20200112251021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100056110510 + 10100056110511.

It is an arithmetic number, because the mean of its divisors is an integer number (10100056110511).

Almost surely, 2^{20200112221021} is an apocalyptic number.

It is an amenable number.

20200112221021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20200112221021 is an equidigital number, since it uses as much as digits as its factorization.

20200112221021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20200112221021 its reverse (12012221100202), we get a palindrome (32212333321223).

The spelling of 20200112221021 in words is "twenty trillion, two hundred billion, one hundred twelve million, two hundred twenty-one thousand, twenty-one".