31221242401 has 8 divisors (see below), whose sum is σ = 31604569920. Its totient is φ = 30838085712.

The previous prime is 31221242363. The next prime is 31221242411. The reversal of 31221242401 is 10424212213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31221242401 - 2¹⁵ = 31221209633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31221242411) 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 7 ways as a sum of consecutive naturals, for example, 346695 + ... + 427363.

It is an arithmetic number, because the mean of its divisors is an integer number (3950571240).

Almost surely, 2^31221242401 is an apocalyptic number.

It is an amenable number.

31221242401 is a deficient number, since it is larger than the sum of its proper divisors (383327519).

31221242401 is an equidigital number, since it uses as much as digits as its factorization.

31221242401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85415.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 31221242401 its reverse (10424212213), we get a palindrome (41645454614).

The spelling of 31221242401 in words is "thirty-one billion, two hundred twenty-one million, two hundred forty-two thousand, four hundred one".