122135921 has 4 divisors (see below), whose sum is σ = 122326512. Its totient is φ = 121945332.

The previous prime is 122135891. The next prime is 122135929. The reversal of 122135921 is 129531221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 129531221 = 3343 ⋅38747.

It is a cyclic number.

It is not a de Polignac number, because 122135921 - 2¹⁴ = 122119537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122135929) 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, 94331 + ... + 95616.

It is an arithmetic number, because the mean of its divisors is an integer number (30581628).

Almost surely, 2^122135921 is an apocalyptic number.

It is an amenable number.

122135921 is a deficient number, since it is larger than the sum of its proper divisors (190591).

122135921 is an equidigital number, since it uses as much as digits as its factorization.

122135921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190590.

The product of its digits is 1080, while the sum is 26.

The square root of 122135921 is about 11051.5121589763. The cubic root of 122135921 is about 496.1516849312.

The spelling of 122135921 in words is "one hundred twenty-two million, one hundred thirty-five thousand, nine hundred twenty-one".