1201200001001 has 32 divisors (see below), whose sum is σ = 1614579391488. Its totient is φ = 863046757440.

The previous prime is 1201200000943. The next prime is 1201200001021. The reversal of 1201200001001 is 1001000021021.

It is not a de Polignac number, because 1201200001001 - 2¹⁸ = 1201199738857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1201200001001.

It is not an unprimeable number, because it can be changed into a prime (1201200001021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 246386 + ... + 1569428.

It is an arithmetic number, because the mean of its divisors is an integer number (50455605984).

Almost surely, 2^{1201200001001} is an apocalyptic number.

1201200001001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1201200001001 is a deficient number, since it is larger than the sum of its proper divisors (413379390487).

1201200001001 is a wasteful number, since it uses less digits than its factorization.

1201200001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323981.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 1201200001001 its reverse (1001000021021), we get a palindrome (2202200022022).

The spelling of 1201200001001 in words is "one trillion, two hundred one billion, two hundred million, one thousand, one".