1210001221001 has 8 divisors (see below), whose sum is σ = 1232877055104. Its totient is φ = 1187127076720.

The previous prime is 1210001220983. The next prime is 1210001221019. The reversal of 1210001221001 is 1001221000121.

It is an interprime number because it is at equal distance from previous prime (1210001220983) and next prime (1210001221019).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1210001221001 - 2²⁶ = 1209934112137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1210001221031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1072736 + ... + 1889646.

It is an arithmetic number, because the mean of its divisors is an integer number (154109631888).

Almost surely, 2^{1210001221001} is an apocalyptic number.

It is an amenable number.

1210001221001 is a deficient number, since it is larger than the sum of its proper divisors (22875834103).

1210001221001 is an equidigital number, since it uses as much as digits as its factorization.

1210001221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844911.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1210001221001 its reverse (1001221000121), we get a palindrome (2211222221122).

The spelling of 1210001221001 in words is "one trillion, two hundred ten billion, one million, two hundred twenty-one thousand, one".