31823421 has 32 divisors (see below), whose sum is σ = 51867648. Its totient is φ = 16959360.

The previous prime is 31823417. The next prime is 31823431. The reversal of 31823421 is 12432813.

It is not a de Polignac number, because 31823421 - 2² = 31823417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31823391 and 31823400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31823431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19000 + ... + 20606.

It is an arithmetic number, because the mean of its divisors is an integer number (1620864).

Almost surely, 2^31823421 is an apocalyptic number.

It is an amenable number.

31823421 is a deficient number, since it is larger than the sum of its proper divisors (20044227).

31823421 is a wasteful number, since it uses less digits than its factorization.

31823421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1681.

The product of its digits is 1152, while the sum is 24.

The square root of 31823421 is about 5641.2251328944. The cubic root of 31823421 is about 316.8951711150.

The spelling of 31823421 in words is "thirty-one million, eight hundred twenty-three thousand, four hundred twenty-one".