31050021 has 8 divisors (see below), whose sum is σ = 41446080. Its totient is φ = 20676992.

The previous prime is 31050001. The next prime is 31050083. The reversal of 31050021 is 12005013.

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 31050021 - 2¹⁸ = 30787877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31049979 and 31050006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31050001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2316 + ... + 8213.

It is an arithmetic number, because the mean of its divisors is an integer number (5180760).

Almost surely, 2^31050021 is an apocalyptic number.

It is an amenable number.

31050021 is a deficient number, since it is larger than the sum of its proper divisors (10396059).

31050021 is a wasteful number, since it uses less digits than its factorization.

31050021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11515.

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 31050021 is about 5572.2545706384. The cubic root of 31050021 is about 314.3069368097.

Adding to 31050021 its reverse (12005013), we get a palindrome (43055034).

The spelling of 31050021 in words is "thirty-one million, fifty thousand, twenty-one".