1210121211001 has 2 divisors, whose sum is σ = 1210121211002. Its totient is φ = 1210121211000.

The previous prime is 1210121210993. The next prime is 1210121211011. The reversal of 1210121211001 is 1001121210121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1021209281401 + 188911929600 = 1010549^2 + 434640^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210121211001 - 2³ = 1210121210993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1210121211011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605060605500 + 605060605501.

It is an arithmetic number, because the mean of its divisors is an integer number (605060605501).

Almost surely, 2^{1210121211001} is an apocalyptic number.

It is an amenable number.

1210121211001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210121211001 is an equidigital number, since it uses as much as digits as its factorization.

1210121211001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1210121211001 its reverse (1001121210121), we get a palindrome (2211242421122).

The spelling of 1210121211001 in words is "one trillion, two hundred ten billion, one hundred twenty-one million, two hundred eleven thousand, one".