31060021 has 4 divisors (see below), whose sum is σ = 31409100. Its totient is φ = 30710944.

The previous prime is 31060013. The next prime is 31060027. The reversal of 31060021 is 12006013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12006013 = 2767 ⋅4339.

It can be written as a sum of positive squares in 2 ways, for example, as 9991921 + 21068100 = 3161^2 + 4590^2 .

It is a cyclic number.

It is not a de Polignac number, because 31060021 - 2³ = 31060013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31059983 and 31060010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31060027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174406 + ... + 174583.

It is an arithmetic number, because the mean of its divisors is an integer number (7852275).

Almost surely, 2^31060021 is an apocalyptic number.

It is an amenable number.

31060021 is a deficient number, since it is larger than the sum of its proper divisors (349079).

31060021 is an equidigital number, since it uses as much as digits as its factorization.

31060021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349078.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 31060021 is about 5573.1518012701. The cubic root of 31060021 is about 314.3406751874.

Adding to 31060021 its reverse (12006013), we get a palindrome (43066034).

The spelling of 31060021 in words is "thirty-one million, sixty thousand, twenty-one".