1066221321 has 16 divisors (see below), whose sum is σ = 1555277760. Its totient is φ = 644357120.

The previous prime is 1066221313. The next prime is 1066221349. The reversal of 1066221321 is 1231226601.

It is not a de Polignac number, because 1066221321 - 2³ = 1066221313 is a prime.

It is a super-2 number, since 2×1066221321² = 2273655810709970082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1066221291 and 1066221300.

It is not an unprimeable number, because it can be changed into a prime (1066221311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34116 + ... + 57413.

It is an arithmetic number, because the mean of its divisors is an integer number (97204860).

Almost surely, 2^1066221321 is an apocalyptic number.

1066221321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1066221321 is a deficient number, since it is larger than the sum of its proper divisors (489056439).

1066221321 is a wasteful number, since it uses less digits than its factorization.

1066221321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91896.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1066221321 is about 32653.0445900532. The cubic root of 1066221321 is about 1021.6036931534.

Adding to 1066221321 its reverse (1231226601), we get a palindrome (2297447922).

The spelling of 1066221321 in words is "one billion, sixty-six million, two hundred twenty-one thousand, three hundred twenty-one".