31334343020221 has 4 divisors (see below), whose sum is σ = 31334959197532. Its totient is φ = 31333726842912.

The previous prime is 31334343020203. The next prime is 31334343020269. The reversal of 31334343020221 is 12202034343313.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15338102799321 + 15996240220900 = 3916389^2 + 3999530^2 .

It is a cyclic number.

It is not a de Polignac number, because 31334343020221 - 2¹³ = 31334343012029 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 (31334343021221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 308012370 + ... + 308114083.

It is an arithmetic number, because the mean of its divisors is an integer number (7833739799383).

Almost surely, 2^{31334343020221} is an apocalyptic number.

It is an amenable number.

31334343020221 is a deficient number, since it is larger than the sum of its proper divisors (616177311).

31334343020221 is an equidigital number, since it uses as much as digits as its factorization.

31334343020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616177310.

The product of its (nonzero) digits is 31104, while the sum is 31.

Adding to 31334343020221 its reverse (12202034343313), we get a palindrome (43536377363534).

The spelling of 31334343020221 in words is "thirty-one trillion, three hundred thirty-four billion, three hundred forty-three million, twenty thousand, two hundred twenty-one".