1200003212021 has 8 divisors (see below), whose sum is σ = 1220730317784. Its totient is φ = 1179449555200.

The previous prime is 1200003211997. The next prime is 1200003212047. The reversal of 1200003212021 is 1202123000021.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 310933372996 + 889069839025 = 557614^2 + 942905^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200003212021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200003211987 and 1200003212005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200003214021) 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, 43348280 + ... + 43375953.

It is an arithmetic number, because the mean of its divisors is an integer number (152591289723).

Almost surely, 2^{1200003212021} is an apocalyptic number.

It is an amenable number.

1200003212021 is a deficient number, since it is larger than the sum of its proper divisors (20727105763).

1200003212021 is a wasteful number, since it uses less digits than its factorization.

1200003212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86724471.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 1200003212021 its reverse (1202123000021), we get a palindrome (2402126212042).

The spelling of 1200003212021 in words is "one trillion, two hundred billion, three million, two hundred twelve thousand, twenty-one".