1201312031221 has 4 divisors (see below), whose sum is σ = 1202217316672. Its totient is φ = 1200406745772.

The previous prime is 1201312031201. The next prime is 1201312031233. The reversal of 1201312031221 is 1221302131021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1201312031221 - 2²⁹ = 1200775160309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201312031201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 452640735 + ... + 452643388.

It is an arithmetic number, because the mean of its divisors is an integer number (300554329168).

Almost surely, 2^{1201312031221} is an apocalyptic number.

It is an amenable number.

1201312031221 is a deficient number, since it is larger than the sum of its proper divisors (905285451).

1201312031221 is an equidigital number, since it uses as much as digits as its factorization.

1201312031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905285450.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1201312031221 its reverse (1221302131021), we get a palindrome (2422614162242).

The spelling of 1201312031221 in words is "one trillion, two hundred one billion, three hundred twelve million, thirty-one thousand, two hundred twenty-one".