30211021 has 4 divisors (see below), whose sum is σ = 30235612. Its totient is φ = 30186432.

The previous prime is 30211001. The next prime is 30211031. The reversal of 30211021 is 12011203.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16924996 + 13286025 = 4114^2 + 3645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30211021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30210989 and 30211007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30211001) 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 3 ways as a sum of consecutive naturals, for example, 10350 + ... + 12943.

It is an arithmetic number, because the mean of its divisors is an integer number (7558903).

Almost surely, 2^30211021 is an apocalyptic number.

It is an amenable number.

30211021 is a deficient number, since it is larger than the sum of its proper divisors (24591).

30211021 is a wasteful number, since it uses less digits than its factorization.

30211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24590.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 30211021 is about 5496.4553122899. The cubic root of 30211021 is about 311.4500949349.

Adding to 30211021 its reverse (12011203), we get a palindrome (42222224).

The spelling of 30211021 in words is "thirty million, two hundred eleven thousand, twenty-one".