1200001212021 has 8 divisors (see below), whose sum is σ = 1601506795840. Its totient is φ = 799248218112.

The previous prime is 1200001211999. The next prime is 1200001212041. The reversal of 1200001212021 is 1202121000021.

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

It is not a de Polignac number, because 1200001212021 - 2²⁵ = 1199967657589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200001211988 and 1200001212006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200001212041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188143756 + ... + 188150133.

It is an arithmetic number, because the mean of its divisors is an integer number (200188349480).

Almost surely, 2^{1200001212021} is an apocalyptic number.

It is an amenable number.

1200001212021 is a deficient number, since it is larger than the sum of its proper divisors (401505583819).

1200001212021 is a wasteful number, since it uses less digits than its factorization.

1200001212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376294955.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1200001212021 its reverse (1202121000021), we get a palindrome (2402122212042).

The spelling of 1200001212021 in words is "one trillion, two hundred billion, one million, two hundred twelve thousand, twenty-one".