1201312020021 has 16 divisors (see below), whose sum is σ = 1645823928000. Its totient is φ = 778858028928.

The previous prime is 1201312020017. The next prime is 1201312020043. The reversal of 1201312020021 is 1200202131021.

It is not a de Polignac number, because 1201312020021 - 2² = 1201312020017 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201312022021) 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 15 ways as a sum of consecutive naturals, for example, 2345056 + ... + 2811033.

It is an arithmetic number, because the mean of its divisors is an integer number (102863995500).

Almost surely, 2^{1201312020021} is an apocalyptic number.

It is an amenable number.

1201312020021 is a deficient number, since it is larger than the sum of its proper divisors (444511907979).

1201312020021 is a wasteful number, since it uses less digits than its factorization.

1201312020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5158228.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 1201312020021 its reverse (1200202131021), we get a palindrome (2401514151042).

The spelling of 1201312020021 in words is "one trillion, two hundred one billion, three hundred twelve million, twenty thousand, twenty-one".