122120021 has 8 divisors (see below), whose sum is σ = 124040280. Its totient is φ = 120206592.

The previous prime is 122119969. The next prime is 122120023. The reversal of 122120021 is 120021221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15100996 + 107019025 = 3886^2 + 10345^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 122120021 - 2¹⁸ = 121857877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122119984 and 122120011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122120023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43385 + ... + 46113.

It is an arithmetic number, because the mean of its divisors is an integer number (15505035).

Almost surely, 2^122120021 is an apocalyptic number.

It is an amenable number.

122120021 is a deficient number, since it is larger than the sum of its proper divisors (1920259).

122120021 is an equidigital number, since it uses as much as digits as its factorization.

122120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3415.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 122120021 is about 11050.7927769912. The cubic root of 122120021 is about 496.1301538532.

Adding to 122120021 its reverse (120021221), we get a palindrome (242141242).

It can be divided in two parts, 1221200 and 21, that added together give a palindrome (1221221).

The spelling of 122120021 in words is "one hundred twenty-two million, one hundred twenty thousand, twenty-one".