1206411021 has 12 divisors (see below), whose sum is σ = 1748094972. Its totient is φ = 801734976.

The previous prime is 1206411007. The next prime is 1206411043. The reversal of 1206411021 is 1201146021.

1206411021 is a `hidden beast` number, since 1 + 2 + 0 + 641 + 1 + 0 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 211702500 + 994708521 = 14550^2 + 31539^2 .

It is not a de Polignac number, because 1206411021 - 2⁶ = 1206410957 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1206410985 and 1206411003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1206411121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 208576 + ... + 214281.

It is an arithmetic number, because the mean of its divisors is an integer number (145674581).

Almost surely, 2^1206411021 is an apocalyptic number.

It is an amenable number.

1206411021 is a deficient number, since it is larger than the sum of its proper divisors (541683951).

1206411021 is a wasteful number, since it uses less digits than its factorization.

1206411021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423180 (or 423177 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 1206411021 is about 34733.4280053092. The cubic root of 1206411021 is about 1064.5476330478.

Adding to 1206411021 its reverse (1201146021), we get a palindrome (2407557042).

The spelling of 1206411021 in words is "one billion, two hundred six million, four hundred eleven thousand, twenty-one".