1042665021 has 16 divisors (see below), whose sum is σ = 1549732800. Its totient is φ = 692840304.

The previous prime is 1042665011. The next prime is 1042665053. The reversal of 1042665021 is 1205662401.

1042665021 is a `hidden beast` number, since 1 + 0 + 4 + 2 + 6 + 650 + 2 + 1 = 666.

It is not a de Polignac number, because 1042665021 - 2¹³ = 1042656829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1042665011) 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, 54606 + ... + 71183.

It is an arithmetic number, because the mean of its divisors is an integer number (96858300).

Almost surely, 2^1042665021 is an apocalyptic number.

It is an amenable number.

1042665021 is a deficient number, since it is larger than the sum of its proper divisors (507067779).

1042665021 is a wasteful number, since it uses less digits than its factorization.

1042665021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126105 (or 126099 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1042665021 is about 32290.3239531597. The cubic root of 1042665021 is about 1014.0240794674.

The spelling of 1042665021 in words is "one billion, forty-two million, six hundred sixty-five thousand, twenty-one".