31111020221221 has 8 divisors (see below), whose sum is σ = 32941205893440. Its totient is φ = 29280848511168.

The previous prime is 31111020221189. The next prime is 31111020221243. The reversal of 31111020221221 is 12212202011113.

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 31111020221221 - 2⁵ = 31111020221189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31111020221521) 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, 1283590 + ... + 7991848.

It is an arithmetic number, because the mean of its divisors is an integer number (4117650736680).

Almost surely, 2^{31111020221221} is an apocalyptic number.

It is an amenable number.

31111020221221 is a deficient number, since it is larger than the sum of its proper divisors (1830185672219).

31111020221221 is a wasteful number, since it uses less digits than its factorization.

31111020221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6981083.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 31111020221221 its reverse (12212202011113), we get a palindrome (43323222232334).

The spelling of 31111020221221 in words is "thirty-one trillion, one hundred eleven billion, twenty million, two hundred twenty-one thousand, two hundred twenty-one".