31001221201 has 4 divisors (see below), whose sum is σ = 31509438004. Its totient is φ = 30493004400.

The previous prime is 31001221189. The next prime is 31001221211. The reversal of 31001221201 is 10212210013.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 507330576 + 30493890625 = 22524^2 + 174625^2 .

It is a cyclic number.

It is not a de Polignac number, because 31001221201 - 2²³ = 30992832593 is a prime.

It is a super-2 number, since 2×31001221201² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31001221211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254108310 + ... + 254108431.

It is an arithmetic number, because the mean of its divisors is an integer number (7877359501).

Almost surely, 2^31001221201 is an apocalyptic number.

It is an amenable number.

31001221201 is a deficient number, since it is larger than the sum of its proper divisors (508216803).

31001221201 is an equidigital number, since it uses as much as digits as its factorization.

31001221201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508216802.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 31001221201 its reverse (10212210013), we get a palindrome (41213431214).

The spelling of 31001221201 in words is "thirty-one billion, one million, two hundred twenty-one thousand, two hundred one".