20021021121001 has 2 divisors, whose sum is σ = 20021021121002. Its totient is φ = 20021021121000.

The previous prime is 20021021120983. The next prime is 20021021121019. The reversal of 20021021121001 is 10012112012002.

It is a balanced prime because it is at equal distance from previous prime (20021021120983) and next prime (20021021121019).

It can be written as a sum of positive squares in only one way, i.e., 13321594815376 + 6699426305625 = 3649876^2 + 2588325^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021021121001 - 2⁹ = 20021021120489 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021021221001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010510560500 + 10010510560501.

It is an arithmetic number, because the mean of its divisors is an integer number (10010510560501).

Almost surely, 2^{20021021121001} is an apocalyptic number.

It is an amenable number.

20021021121001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021021121001 is an equidigital number, since it uses as much as digits as its factorization.

20021021121001 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 20021021121001 its reverse (10012112012002), we get a palindrome (30033133133003).

The spelling of 20021021121001 in words is "twenty trillion, twenty-one billion, twenty-one million, one hundred twenty-one thousand, one".