31023021 has 8 divisors (see below), whose sum is σ = 43162560. Its totient is φ = 19782752.

The previous prime is 31023007. The next prime is 31023023. The reversal of 31023021 is 12032013.

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 31023021 - 2¹¹ = 31020973 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31022988 and 31023006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31023023) 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, 224736 + ... + 224873.

It is an arithmetic number, because the mean of its divisors is an integer number (5395320).

Almost surely, 2^31023021 is an apocalyptic number.

It is an amenable number.

31023021 is a deficient number, since it is larger than the sum of its proper divisors (12139539).

31023021 is a wasteful number, since it uses less digits than its factorization.

31023021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449635.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 31023021 is about 5569.8313259918. The cubic root of 31023021 is about 314.2158069919.

Adding to 31023021 its reverse (12032013), we get a palindrome (43055034).

The spelling of 31023021 in words is "thirty-one million, twenty-three thousand, twenty-one".