31132212021 has 6 divisors (see below), whose sum is σ = 44968750710. Its totient is φ = 20754808008.

The previous prime is 31132212019. The next prime is 31132212053. The reversal of 31132212021 is 12021223113.

31132212021 is a `hidden beast` number, since 311 + 322 + 12 + 0 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 26866815921 + 4265396100 = 163911^2 + 65310^2 .

It is not a de Polignac number, because 31132212021 - 2¹ = 31132212019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31132211985 and 31132212003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31132212011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1729567326 + ... + 1729567343.

It is an arithmetic number, because the mean of its divisors is an integer number (7494791785).

Almost surely, 2^31132212021 is an apocalyptic number.

It is an amenable number.

31132212021 is a deficient number, since it is larger than the sum of its proper divisors (13836538689).

31132212021 is a wasteful number, since it uses less digits than its factorization.

31132212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3459134675 (or 3459134672 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31132212021 its reverse (12021223113), we get a palindrome (43153435134).

The spelling of 31132212021 in words is "thirty-one billion, one hundred thirty-two million, two hundred twelve thousand, twenty-one".