1066940021 has 8 divisors (see below), whose sum is σ = 1220134464. Its totient is φ = 913939200.

The previous prime is 1066939987. The next prime is 1066940027. The reversal of 1066940021 is 1200496601.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1066940021 is a prime.

It is a super-2 number, since 2×1066940021² = 2276722016822960882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066940027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36395 + ... + 58808.

It is an arithmetic number, because the mean of its divisors is an integer number (152516808).

Almost surely, 2^1066940021 is an apocalyptic number.

It is an amenable number.

1066940021 is a deficient number, since it is larger than the sum of its proper divisors (153194443).

1066940021 is an equidigital number, since it uses as much as digits as its factorization.

1066940021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96811.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 1066940021 is about 32664.0478355026. The cubic root of 1066940021 is about 1021.8331832383.

The spelling of 1066940021 in words is "one billion, sixty-six million, nine hundred forty thousand, twenty-one".