340172221 has 2 divisors, whose sum is σ = 340172222. Its totient is φ = 340172220.

The previous prime is 340172177. The next prime is 340172237. The reversal of 340172221 is 122271043.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 333464121 + 6708100 = 18261^2 + 2590^2 .

It is an emirp because it is prime and its reverse (122271043) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 340172221 - 2¹⁵ = 340139453 is a prime.

It is equal to p_18303502 and since 340172221 and 18303502 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 340172192 and 340172201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340172251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170086110 + 170086111.

It is an arithmetic number, because the mean of its divisors is an integer number (170086111).

Almost surely, 2^340172221 is an apocalyptic number.

It is an amenable number.

340172221 is a deficient number, since it is larger than the sum of its proper divisors (1).

340172221 is an equidigital number, since it uses as much as digits as its factorization.

340172221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 340172221 is about 18443.7583209063. The cubic root of 340172221 is about 698.0710300920.

The spelling of 340172221 in words is "three hundred forty million, one hundred seventy-two thousand, two hundred twenty-one".