31432021 has 8 divisors (see below), whose sum is σ = 32155704. Its totient is φ = 30713280.

The previous prime is 31432001. The next prime is 31432033. The reversal of 31432021 is 12023413.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10400625 + 21031396 = 3225^2 + 4586^2 .

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 31432021 - 2⁵ = 31431989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31431986 and 31432004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31432001) 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, 13611 + ... + 15751.

It is an arithmetic number, because the mean of its divisors is an integer number (4019463).

Almost surely, 2^31432021 is an apocalyptic number.

It is an amenable number.

31432021 is a deficient number, since it is larger than the sum of its proper divisors (723683).

31432021 is a wasteful number, since it uses less digits than its factorization.

31432021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2471.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 31432021 is about 5606.4267586405. The cubic root of 31432021 is about 315.5906311758.

Adding to 31432021 its reverse (12023413), we get a palindrome (43455434).

The spelling of 31432021 in words is "thirty-one million, four hundred thirty-two thousand, twenty-one".