1226580221 has 4 divisors (see below), whose sum is σ = 1227728700. Its totient is φ = 1225431744.

The previous prime is 1226580211. The next prime is 1226580239. The reversal of 1226580221 is 1220856221.

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 436183225 + 790396996 = 20885^2 + 28114^2 .

It is a cyclic number.

It is not a de Polignac number, because 1226580221 - 2¹⁰ = 1226579197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1226580211) 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, 572636 + ... + 574773.

It is an arithmetic number, because the mean of its divisors is an integer number (306932175).

Almost surely, 2^1226580221 is an apocalyptic number.

It is an amenable number.

1226580221 is a deficient number, since it is larger than the sum of its proper divisors (1148479).

1226580221 is a wasteful number, since it uses less digits than its factorization.

1226580221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1148478.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 1226580221 is about 35022.5673102358. The cubic root of 1226580221 is about 1070.4473690465.

The spelling of 1226580221 in words is "one billion, two hundred twenty-six million, five hundred eighty thousand, two hundred twenty-one".