1226120521 has 4 divisors (see below), whose sum is σ = 1290653200. Its totient is φ = 1161587844.

The previous prime is 1226120509. The next prime is 1226120531. The reversal of 1226120521 is 1250216221.

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: 1250216221 = 23 ⋅54357227.

It is a cyclic number.

It is not a de Polignac number, because 1226120521 - 2⁹ = 1226120009 is a prime.

It is a super-2 number, since 2×1226120521² = 3006743064034622882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1226120492 and 1226120501.

It is not an unprimeable number, because it can be changed into a prime (1226120531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32266311 + ... + 32266348.

It is an arithmetic number, because the mean of its divisors is an integer number (322663300).

Almost surely, 2^1226120521 is an apocalyptic number.

It is an amenable number.

1226120521 is a deficient number, since it is larger than the sum of its proper divisors (64532679).

1226120521 is an equidigital number, since it uses as much as digits as its factorization.

1226120521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64532678.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 1226120521 is about 35016.0037839843. The cubic root of 1226120521 is about 1070.3136242563.

Adding to 1226120521 its reverse (1250216221), we get a palindrome (2476336742).

The spelling of 1226120521 in words is "one billion, two hundred twenty-six million, one hundred twenty thousand, five hundred twenty-one".