1201304121 has 4 divisors (see below), whose sum is σ = 1601738832. Its totient is φ = 800869412.

The previous prime is 1201304119. The next prime is 1201304129. The reversal of 1201304121 is 1214031021.

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.

It is a cyclic number.

It is not a de Polignac number, because 1201304121 - 2¹ = 1201304119 is a prime.

It is a super-2 number, since 2×1201304121² = 2886263182263165282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1201304121.

It is not an unprimeable number, because it can be changed into a prime (1201304129) 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, 200217351 + ... + 200217356.

It is an arithmetic number, because the mean of its divisors is an integer number (400434708).

Almost surely, 2^1201304121 is an apocalyptic number.

It is an amenable number.

1201304121 is a deficient number, since it is larger than the sum of its proper divisors (400434711).

1201304121 is an equidigital number, since it uses as much as digits as its factorization.

1201304121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400434710.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1201304121 is about 34659.8344052594. The cubic root of 1201304121 is about 1063.0433840803.

Adding to 1201304121 its reverse (1214031021), we get a palindrome (2415335142).

It can be divided in two parts, 120130 and 4121, that added together give a triangular number (124251 = T₄₉₈).

The spelling of 1201304121 in words is "one billion, two hundred one million, three hundred four thousand, one hundred twenty-one".