1201230331021 has 16 divisors (see below), whose sum is σ = 1397080713600. Its totient is φ = 1011465903168.

The previous prime is 1201230331009. The next prime is 1201230331061. The reversal of 1201230331021 is 1201330321021.

It is not a de Polignac number, because 1201230331021 - 2¹¹ = 1201230328973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1201230331021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201230331001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 427510 + ... + 1607863.

It is an arithmetic number, because the mean of its divisors is an integer number (87317544600).

Almost surely, 2^{1201230331021} is an apocalyptic number.

It is an amenable number.

1201230331021 is a deficient number, since it is larger than the sum of its proper divisors (195850382579).

1201230331021 is a wasteful number, since it uses less digits than its factorization.

1201230331021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2036868.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 1201230331021 its reverse (1201330321021), we get a palindrome (2402560652042).

The spelling of 1201230331021 in words is "one trillion, two hundred one billion, two hundred thirty million, three hundred thirty-one thousand, twenty-one".