1226355021 has 12 divisors (see below), whose sum is σ = 1773163548. Its totient is φ = 816756864.

The previous prime is 1226355017. The next prime is 1226355043. The reversal of 1226355021 is 1205536221.

It is a happy number.

1226355021 is a `hidden beast` number, since 1 + 2 + 2 + 635 + 5 + 0 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 305900100 + 920454921 = 17490^2 + 30339^2 .

It is not a de Polignac number, because 1226355021 - 2² = 1226355017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1226355001) 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 11 ways as a sum of consecutive naturals, for example, 58140 + ... + 76373.

It is an arithmetic number, because the mean of its divisors is an integer number (147763629).

Almost surely, 2^1226355021 is an apocalyptic number.

It is an amenable number.

1226355021 is a deficient number, since it is larger than the sum of its proper divisors (546808527).

1226355021 is a wasteful number, since it uses less digits than its factorization.

1226355021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135532 (or 135529 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 1226355021 is about 35019.3520928072. The cubic root of 1226355021 is about 1070.3818536952.

The spelling of 1226355021 in words is "one billion, two hundred twenty-six million, three hundred fifty-five thousand, twenty-one".