113021221 has 2 divisors, whose sum is σ = 113021222. Its totient is φ = 113021220.

The previous prime is 113021213. The next prime is 113021231. The reversal of 113021221 is 122120311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111302500 + 1718721 = 10550^2 + 1311^2 .

It is an emirp because it is prime and its reverse (122120311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 113021221 - 2³ = 113021213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113021231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56510610 + 56510611.

It is an arithmetic number, because the mean of its divisors is an integer number (56510611).

Almost surely, 2^113021221 is an apocalyptic number.

It is an amenable number.

113021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

113021221 is an equidigital number, since it uses as much as digits as its factorization.

113021221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 113021221 is about 10631.1439177541. The cubic root of 113021221 is about 483.4890747681.

Adding to 113021221 its reverse (122120311), we get a palindrome (235141532).

The spelling of 113021221 in words is "one hundred thirteen million, twenty-one thousand, two hundred twenty-one".