1210001221009 has 16 divisors (see below), whose sum is σ = 1397425994496. Its totient is φ = 1026231192000.

The previous prime is 1210001220983. The next prime is 1210001221019. The reversal of 1210001221009 is 9001221000121.

It is a happy number.

It is not a de Polignac number, because 1210001221009 - 2⁷ = 1210001220881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1210001221019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 593244 + ... + 1664914.

It is an arithmetic number, because the mean of its divisors is an integer number (87339124656).

Almost surely, 2^{1210001221009} is an apocalyptic number.

It is an amenable number.

1210001221009 is a deficient number, since it is larger than the sum of its proper divisors (187424773487).

1210001221009 is a wasteful number, since it uses less digits than its factorization.

1210001221009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073376.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 1210001221009 in words is "one trillion, two hundred ten billion, one million, two hundred twenty-one thousand, nine".