31215212401 has 4 divisors (see below), whose sum is σ = 31270657392. Its totient is φ = 31159767412.

The previous prime is 31215212317. The next prime is 31215212417. The reversal of 31215212401 is 10421251213.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10421251213 = 7591 ⋅1372843.

It is a cyclic number.

It is not a de Polignac number, because 31215212401 - 2¹¹ = 31215210353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31215212491) 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, 27721651 + ... + 27722776.

It is an arithmetic number, because the mean of its divisors is an integer number (7817664348).

Almost surely, 2^31215212401 is an apocalyptic number.

It is an amenable number.

31215212401 is a deficient number, since it is larger than the sum of its proper divisors (55444991).

31215212401 is an equidigital number, since it uses as much as digits as its factorization.

31215212401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55444990.

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 31215212401 its reverse (10421251213), we get a palindrome (41636463614).

The spelling of 31215212401 in words is "thirty-one billion, two hundred fifteen million, two hundred twelve thousand, four hundred one".