1204122121 has 4 divisors (see below), whose sum is σ = 1274952852. Its totient is φ = 1133291392.

The previous prime is 1204122107. The next prime is 1204122133. The reversal of 1204122121 is 1212214021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 619014400 + 585107721 = 24880^2 + 24189^2 .

It is a cyclic number.

It is not a de Polignac number, because 1204122121 - 2⁹ = 1204121609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1204122095 and 1204122104.

It is not an unprimeable number, because it can be changed into a prime (1204122721) 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, 35415340 + ... + 35415373.

It is an arithmetic number, because the mean of its divisors is an integer number (318738213).

Almost surely, 2^1204122121 is an apocalyptic number.

It is an amenable number.

1204122121 is a deficient number, since it is larger than the sum of its proper divisors (70830731).

1204122121 is an equidigital number, since it uses as much as digits as its factorization.

1204122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70830730.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1204122121 is about 34700.4628355300. The cubic root of 1204122121 is about 1063.8739583605.

Adding to 1204122121 its reverse (1212214021), we get a palindrome (2416336142).

The spelling of 1204122121 in words is "one billion, two hundred four million, one hundred twenty-two thousand, one hundred twenty-one".