31021210113221 has 8 divisors (see below), whose sum is σ = 31226792787264. Its totient is φ = 30815629336800.

The previous prime is 31021210113197. The next prime is 31021210113241. The reversal of 31021210113221 is 12231101212013.

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 31021210113221 - 2¹⁸ = 31021209851077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31021210113193 and 31021210113202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31021210113241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50203481 + ... + 50817633.

It is an arithmetic number, because the mean of its divisors is an integer number (3903349098408).

Almost surely, 2^{31021210113221} is an apocalyptic number.

It is an amenable number.

31021210113221 is a deficient number, since it is larger than the sum of its proper divisors (205582674043).

31021210113221 is a wasteful number, since it uses less digits than its factorization.

31021210113221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948811.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 31021210113221 its reverse (12231101212013), we get a palindrome (43252311325234).

The spelling of 31021210113221 in words is "thirty-one trillion, twenty-one billion, two hundred ten million, one hundred thirteen thousand, two hundred twenty-one".