1021406066 has 16 divisors (see below), whose sum is σ = 1613852160. Its totient is φ = 483492240.

The previous prime is 1021406039. The next prime is 1021406069. The reversal of 1021406066 is 6606041201.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1021406069) 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 7 ways as a sum of consecutive naturals, for example, 52271 + ... + 69101.

It is an arithmetic number, because the mean of its divisors is an integer number (100865760).

Almost surely, 2^1021406066 is an apocalyptic number.

1021406066 is a deficient number, since it is larger than the sum of its proper divisors (592446094).

1021406066 is a wasteful number, since it uses less digits than its factorization.

1021406066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18449.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1021406066 is about 31959.4440815231. Note that the first 3 decimals coincide. The cubic root of 1021406066 is about 1007.0850390046.

Adding to 1021406066 its reverse (6606041201), we get a palindrome (7627447267).

The spelling of 1021406066 in words is "one billion, twenty-one million, four hundred six thousand, sixty-six".