1221010122001 has 2 divisors, whose sum is σ = 1221010122002. Its totient is φ = 1221010122000.

The previous prime is 1221010121987. The next prime is 1221010122023. The reversal of 1221010122001 is 1002210101221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 768147073600 + 452863048401 = 876440^2 + 672951^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221010122001 - 2¹⁹ = 1221009597713 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221010122601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610505061000 + 610505061001.

It is an arithmetic number, because the mean of its divisors is an integer number (610505061001).

Almost surely, 2^{1221010122001} is an apocalyptic number.

It is an amenable number.

1221010122001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221010122001 is an equidigital number, since it uses as much as digits as its factorization.

1221010122001 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 1221010122001 its reverse (1002210101221), we get a palindrome (2223220223222).

The spelling of 1221010122001 in words is "one trillion, two hundred twenty-one billion, ten million, one hundred twenty-two thousand, one".