31221023133 has 8 divisors (see below), whose sum is σ = 41629128928. Its totient is φ = 20813466384.

The previous prime is 31221023123. The next prime is 31221023143. The reversal of 31221023133 is 33132012213.

It is an interprime number because it is at equal distance from previous prime (31221023123) and next prime (31221023143).

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

It is not a de Polignac number, because 31221023133 - 2⁶ = 31221023069 is a prime.

It is a super-2 number, since 2×31221023133² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221023123) 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, 21735 + ... + 250827.

It is an arithmetic number, because the mean of its divisors is an integer number (5203641116).

Almost surely, 2^31221023133 is an apocalyptic number.

It is an amenable number.

31221023133 is a deficient number, since it is larger than the sum of its proper divisors (10408105795).

31221023133 is a wasteful number, since it uses less digits than its factorization.

31221023133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274523.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31221023133 its reverse (33132012213), we get a palindrome (64353035346).

The spelling of 31221023133 in words is "thirty-one billion, two hundred twenty-one million, twenty-three thousand, one hundred thirty-three".