30212681 has 12 divisors (see below), whose sum is σ = 31554432. Its totient is φ = 28912104.

The previous prime is 30212671. The next prime is 30212719. The reversal of 30212681 is 18621203.

It is a de Polignac number, because none of the positive numbers 2^k-30212681 is a prime.

It is a super-2 number, since 2×30212681² = 1825612186415522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30212671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 293276 + ... + 293378.

It is an arithmetic number, because the mean of its divisors is an integer number (2629536).

Almost surely, 2^30212681 is an apocalyptic number.

It is an amenable number.

30212681 is a deficient number, since it is larger than the sum of its proper divisors (1341751).

30212681 is an equidigital number, since it uses as much as digits as its factorization.

30212681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 30212681 is about 5496.6063166285. The cubic root of 30212681 is about 311.4557992295.

Adding to 30212681 its reverse (18621203), we get a palindrome (48833884).

The spelling of 30212681 in words is "thirty million, two hundred twelve thousand, six hundred eighty-one".