31030021 has 8 divisors (see below), whose sum is σ = 35632800. Its totient is φ = 26724240.

The previous prime is 31030001. The next prime is 31030067. The reversal of 31030021 is 12003013.

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 31030021 - 2¹³ = 31021829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31030001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74026 + ... + 74443.

It is an arithmetic number, because the mean of its divisors is an integer number (4454100).

Almost surely, 2^31030021 is an apocalyptic number.

It is an amenable number.

31030021 is a deficient number, since it is larger than the sum of its proper divisors (4602779).

31030021 is a wasteful number, since it uses less digits than its factorization.

31030021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148499.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 31030021 is about 5570.4596758257. The cubic root of 31030021 is about 314.2394383165.

Adding to 31030021 its reverse (12003013), we get a palindrome (43033034).

The spelling of 31030021 in words is "thirty-one million, thirty thousand, twenty-one".