20010021021121 has 2 divisors, whose sum is σ = 20010021021122. Its totient is φ = 20010021021120.

The previous prime is 20010021021097. The next prime is 20010021021127. The reversal of 20010021021121 is 12112012001002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14727672652225 + 5282348368896 = 3837665^2 + 2298336^2 .

It is a cyclic number.

It is not a de Polignac number, because 20010021021121 - 2⁷ = 20010021020993 is a prime.

It is not a weakly prime, because it can be changed into another prime (20010021021127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005010510560 + 10005010510561.

It is an arithmetic number, because the mean of its divisors is an integer number (10005010510561).

Almost surely, 2^{20010021021121} is an apocalyptic number.

It is an amenable number.

20010021021121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010021021121 is an equidigital number, since it uses as much as digits as its factorization.

20010021021121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20010021021121 its reverse (12112012001002), we get a palindrome (32122033022123).

The spelling of 20010021021121 in words is "twenty trillion, ten billion, twenty-one million, twenty-one thousand, one hundred twenty-one".