31220401221244 has 6 divisors (see below), whose sum is σ = 54635702137184. Its totient is φ = 15610200610620.

The previous prime is 31220401221239. The next prime is 31220401221257. The reversal of 31220401221244 is 44212210402213.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3902550152652 + ... + 3902550152659.

Almost surely, 2^{31220401221244} is an apocalyptic number.

It is an amenable number.

31220401221244 is a deficient number, since it is larger than the sum of its proper divisors (23415300915940).

31220401221244 is a wasteful number, since it uses less digits than its factorization.

31220401221244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7805100305315 (or 7805100305313 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 31220401221244 its reverse (44212210402213), we get a palindrome (75432611623457).

The spelling of 31220401221244 in words is "thirty-one trillion, two hundred twenty billion, four hundred one million, two hundred twenty-one thousand, two hundred forty-four".