31001021002221 has 8 divisors (see below), whose sum is σ = 41343639655584. Its totient is φ = 20662874841840.

The previous prime is 31001021002219. The next prime is 31001021002243. The reversal of 31001021002221 is 12220012010013.

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

It is not a de Polignac number, because 31001021002221 - 2¹ = 31001021002219 is a prime.

It is a super-2 number, since 2×31001021002221² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31001021002221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31001021002261) 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, 1118107071 + ... + 1118134796.

It is an arithmetic number, because the mean of its divisors is an integer number (5167954956948).

Almost surely, 2^{31001021002221} is an apocalyptic number.

It is an amenable number.

31001021002221 is a deficient number, since it is larger than the sum of its proper divisors (10342618653363).

31001021002221 is a wasteful number, since it uses less digits than its factorization.

31001021002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2236246491.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 31001021002221 its reverse (12220012010013), we get a palindrome (43221033012234).

The spelling of 31001021002221 in words is "thirty-one trillion, one billion, twenty-one million, two thousand, two hundred twenty-one".