140212217 has 2 divisors, whose sum is σ = 140212218. Its totient is φ = 140212216.

The previous prime is 140212213. The next prime is 140212249. The reversal of 140212217 is 712212041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99520576 + 40691641 = 9976^2 + 6379^2 .

It is a cyclic number.

It is not a de Polignac number, because 140212217 - 2² = 140212213 is a prime.

It is not a weakly prime, because it can be changed into another prime (140212213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70106108 + 70106109.

It is an arithmetic number, because the mean of its divisors is an integer number (70106109).

Almost surely, 2^140212217 is an apocalyptic number.

It is an amenable number.

140212217 is a deficient number, since it is larger than the sum of its proper divisors (1).

140212217 is an equidigital number, since it uses as much as digits as its factorization.

140212217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 140212217 is about 11841.1239753665. The cubic root of 140212217 is about 519.5116433291.

Adding to 140212217 its reverse (712212041), we get a palindrome (852424258).

The spelling of 140212217 in words is "one hundred forty million, two hundred twelve thousand, two hundred seventeen".