1011220020121 has 2 divisors, whose sum is σ = 1011220020122. Its totient is φ = 1011220020120.

The previous prime is 1011220020103. The next prime is 1011220020127. The reversal of 1011220020121 is 1210200221101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 872236452096 + 138983568025 = 933936^2 + 372805^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011220020121 - 2¹⁹ = 1011219495833 is a prime.

It is not a weakly prime, because it can be changed into another prime (1011220020127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505610010060 + 505610010061.

It is an arithmetic number, because the mean of its divisors is an integer number (505610010061).

Almost surely, 2^{1011220020121} is an apocalyptic number.

It is an amenable number.

1011220020121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011220020121 is an equidigital number, since it uses as much as digits as its factorization.

1011220020121 is an evil number, because the sum of its binary digits is even.

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

Adding to 1011220020121 its reverse (1210200221101), we get a palindrome (2221420241222).

The spelling of 1011220020121 in words is "one trillion, eleven billion, two hundred twenty million, twenty thousand, one hundred twenty-one".