30212131 has 2 divisors, whose sum is σ = 30212132. Its totient is φ = 30212130.
The previous prime is 30212129. The next prime is 30212153. The reversal of 30212131 is 13121203.
It is a weak prime.
It is an emirp because it is prime and its reverse (13121203) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 30212131 - 21 = 30212129 is a prime.
It is a super-2 number, since 2×302121312 = 1825545719122322, which contains 22 as substring.
Together with 30212129, it forms a pair of twin primes.
It is not a weakly prime, because it can be changed into another prime (30212431) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15106065 + 15106066.
It is an arithmetic number, because the mean of its divisors is an integer number (15106066).
Almost surely, 230212131 is an apocalyptic number.
30212131 is a deficient number, since it is larger than the sum of its proper divisors (1).
30212131 is an equidigital number, since it uses as much as digits as its factorization.
30212131 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 36, while the sum is 13.
The square root of 30212131 is about 5496.5562855301. The cubic root of 30212131 is about 311.4539092755.
Adding to 30212131 its reverse (13121203), we get a palindrome (43333334).
The spelling of 30212131 in words is "thirty million, two hundred twelve thousand, one hundred thirty-one".
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