1066061021 has 4 divisors (see below), whose sum is σ = 1076411232. Its totient is φ = 1055710812.

The previous prime is 1066061011. The next prime is 1066061023. The reversal of 1066061021 is 1201606601.

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: 1201606601 = 13 ⋅92431277.

It is a cyclic number.

It is not a de Polignac number, because 1066061021 - 2¹⁰ = 1066059997 is a prime.

It is a super-2 number, since 2×1066061021² = 2272972200991124882, 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 (1066061023) 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, 5174951 + ... + 5175156.

It is an arithmetic number, because the mean of its divisors is an integer number (269102808).

Almost surely, 2^1066061021 is an apocalyptic number.

It is an amenable number.

1066061021 is a deficient number, since it is larger than the sum of its proper divisors (10350211).

1066061021 is a wasteful number, since it uses less digits than its factorization.

1066061021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10350210.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1066061021 is about 32650.5899027874. The cubic root of 1066061021 is about 1021.5524932520.

Adding to 1066061021 its reverse (1201606601), we get a palindrome (2267667622).

The spelling of 1066061021 in words is "one billion, sixty-six million, sixty-one thousand, twenty-one".