1004120021 has 8 divisors (see below), whose sum is σ = 1009357440. Its totient is φ = 998891712.

The previous prime is 1004120003. The next prime is 1004120027. The reversal of 1004120021 is 1200214001.

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-1004120021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1004119984 and 1004120011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1004120027) 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, 353021 + ... + 355853.

It is an arithmetic number, because the mean of its divisors is an integer number (126169680).

Almost surely, 2^1004120021 is an apocalyptic number.

It is an amenable number.

1004120021 is a deficient number, since it is larger than the sum of its proper divisors (5237419).

1004120021 is a wasteful number, since it uses less digits than its factorization.

1004120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4555.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1004120021 is about 31687.8528934985. The cubic root of 1004120021 is about 1001.3714585749.

Adding to 1004120021 its reverse (1200214001), we get a palindrome (2204334022).

The spelling of 1004120021 in words is "one billion, four million, one hundred twenty thousand, twenty-one".