1020201212021 has 2 divisors, whose sum is σ = 1020201212022. Its totient is φ = 1020201212020.

The previous prime is 1020201211993. The next prime is 1020201212057. The reversal of 1020201212021 is 1202121020201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 626709722500 + 393491489521 = 791650^2 + 627289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020201212021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1020201211987 and 1020201212005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020201212071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510100606010 + 510100606011.

It is an arithmetic number, because the mean of its divisors is an integer number (510100606011).

Almost surely, 2^{1020201212021} is an apocalyptic number.

It is an amenable number.

1020201212021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020201212021 is an equidigital number, since it uses as much as digits as its factorization.

1020201212021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1020201212021 its reverse (1202121020201), we get a palindrome (2222322232222).

The spelling of 1020201212021 in words is "one trillion, twenty billion, two hundred one million, two hundred twelve thousand, twenty-one".