1201012121009 has 4 divisors (see below), whose sum is σ = 1201018915440. Its totient is φ = 1201005326580.

The previous prime is 1201012120981. The next prime is 1201012121033. The reversal of 1201012121009 is 9001212101021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1201012121009 - 2²⁸ = 1200743685553 is a prime.

It is a super-4 number, since 4×1201012121009⁴ (a number of 49 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1201012321009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3124787 + ... + 3488024.

It is an arithmetic number, because the mean of its divisors is an integer number (300254728860).

Almost surely, 2^{1201012121009} is an apocalyptic number.

It is an amenable number.

1201012121009 is a deficient number, since it is larger than the sum of its proper divisors (6794431).

1201012121009 is an equidigital number, since it uses as much as digits as its factorization.

1201012121009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6794430.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 1201012121009 in words is "one trillion, two hundred one billion, twelve million, one hundred twenty-one thousand, nine".