122140421 has 4 divisors (see below), whose sum is σ = 131535852. Its totient is φ = 112744992.

The previous prime is 122140409. The next prime is 122140423. The reversal of 122140421 is 124041221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124041221 = 10949 ⋅11329.

It can be written as a sum of positive squares in 2 ways, for example, as 22420225 + 99720196 = 4735^2 + 9986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122140421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 122140421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122140423) 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, 4697696 + ... + 4697721.

It is an arithmetic number, because the mean of its divisors is an integer number (32883963).

Almost surely, 2^122140421 is an apocalyptic number.

It is an amenable number.

122140421 is a deficient number, since it is larger than the sum of its proper divisors (9395431).

122140421 is an equidigital number, since it uses as much as digits as its factorization.

122140421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9395430.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 122140421 is about 11051.7157491495. The cubic root of 122140421 is about 496.1577782933.

Adding to 122140421 its reverse (124041221), we get a palindrome (246181642).

The spelling of 122140421 in words is "one hundred twenty-two million, one hundred forty thousand, four hundred twenty-one".