31321042021 has 8 divisors (see below), whose sum is σ = 32452889760. Its totient is φ = 30209227152.

The previous prime is 31321042001. The next prime is 31321042091. The reversal of 31321042021 is 12024012313.

It is a happy number.

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 31321042021 - 2⁵ = 31321041989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31321042021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321042001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5005035 + ... + 5011288.

It is an arithmetic number, because the mean of its divisors is an integer number (4056611220).

Almost surely, 2^31321042021 is an apocalyptic number.

It is an amenable number.

31321042021 is a deficient number, since it is larger than the sum of its proper divisors (1131847739).

31321042021 is a wasteful number, since it uses less digits than its factorization.

31321042021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10016435.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 31321042021 its reverse (12024012313), we get a palindrome (43345054334).

The spelling of 31321042021 in words is "thirty-one billion, three hundred twenty-one million, forty-two thousand, twenty-one".