122540213 has 4 divisors (see below), whose sum is σ = 122595948. Its totient is φ = 122484480.

The previous prime is 122540207. The next prime is 122540221. The reversal of 122540213 is 312045221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312045221 = 12251 ⋅25471.

It can be written as a sum of positive squares in 2 ways, for example, as 57866449 + 64673764 = 7607^2 + 8042^2 .

It is a cyclic number.

It is not a de Polignac number, because 122540213 - 2¹⁸ = 122278069 is a prime.

It is a super-2 number, since 2×122540213² = 30032207604170738, 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 (122540713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24428 + ... + 29013.

It is an arithmetic number, because the mean of its divisors is an integer number (30648987).

Almost surely, 2^122540213 is an apocalyptic number.

It is an amenable number.

122540213 is a deficient number, since it is larger than the sum of its proper divisors (55735).

122540213 is an equidigital number, since it uses as much as digits as its factorization.

122540213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55734.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 122540213 is about 11069.7882996921. The cubic root of 122540213 is about 496.6985326060.

Adding to 122540213 its reverse (312045221), we get a palindrome (434585434).

The spelling of 122540213 in words is "one hundred twenty-two million, five hundred forty thousand, two hundred thirteen".