1012011021 has 12 divisors (see below), whose sum is σ = 1670621472. Its totient is φ = 578291976.

The previous prime is 1012010981. The next prime is 1012011023. The reversal of 1012011021 is 1201102101.

It is a happy number.

It is not a de Polignac number, because 1012011021 - 2¹¹ = 1012008973 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1012010994 and 1012011012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012011023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8031771 + ... + 8031896.

It is an arithmetic number, because the mean of its divisors is an integer number (139218456).

Almost surely, 2^1012011021 is an apocalyptic number.

It is an amenable number.

1012011021 is a deficient number, since it is larger than the sum of its proper divisors (658610451).

1012011021 is a wasteful number, since it uses less digits than its factorization.

1012011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16063680 (or 16063677 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1012011021 is about 31812.1206617855. The cubic root of 1012011021 is about 1003.9877503757.

Adding to 1012011021 its reverse (1201102101), we get a palindrome (2213113122).

The spelling of 1012011021 in words is "one billion, twelve million, eleven thousand, twenty-one".