1066056421 has 4 divisors (see below), whose sum is σ = 1066258144. Its totient is φ = 1065854700.

The previous prime is 1066056419. The next prime is 1066056437. The reversal of 1066056421 is 1246506601.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1246506601 = 71 ⋅17556431.

It is a cyclic number.

It is not a de Polignac number, because 1066056421 - 2¹ = 1066056419 is a prime.

It is a super-2 number, since 2×1066056421² = 2272952585510658482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066056461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92715 + ... + 103576.

It is an arithmetic number, because the mean of its divisors is an integer number (266564536).

Almost surely, 2^1066056421 is an apocalyptic number.

It is an amenable number.

1066056421 is a deficient number, since it is larger than the sum of its proper divisors (201723).

1066056421 is an equidigital number, since it uses as much as digits as its factorization.

1066056421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201722.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1066056421 is about 32650.5194598800. The cubic root of 1066056421 is about 1021.5510239339.

It can be divided in two parts, 10660 and 56421, that added together give a square (67081 = 259²).

The spelling of 1066056421 in words is "one billion, sixty-six million, fifty-six thousand, four hundred twenty-one".