1026664221 has 64 divisors (see below), whose sum is σ = 1692748800. Its totient is φ = 545356800.

The previous prime is 1026664211. The next prime is 1026664229. The reversal of 1026664221 is 1224666201.

It is not a de Polignac number, because 1026664221 - 2⁶ = 1026664157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1026664229) 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 63 ways as a sum of consecutive naturals, for example, 649410 + ... + 650988.

It is an arithmetic number, because the mean of its divisors is an integer number (26449200).

Almost surely, 2^1026664221 is an apocalyptic number.

1026664221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1026664221 is a deficient number, since it is larger than the sum of its proper divisors (666084579).

1026664221 is a wasteful number, since it uses less digits than its factorization.

1026664221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1690.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 1026664221 is about 32041.6014112903. The cubic root of 1026664221 is about 1008.8102256407.

The spelling of 1026664221 in words is "one billion, twenty-six million, six hundred sixty-four thousand, two hundred twenty-one".