1011010021 has 16 divisors (see below), whose sum is σ = 1185125760. Its totient is φ = 844369920.

The previous prime is 1011010019. The next prime is 1011010031. The reversal of 1011010021 is 1200101101.

1011010021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 1011010021 - 2¹ = 1011010019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a junction number, because it is equal to n+sod(n) for n = 1011009986 and 1011010013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011010031) 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, 290725 + ... + 294181.

It is an arithmetic number, because the mean of its divisors is an integer number (74070360).

Almost surely, 2^1011010021 is an apocalyptic number.

It is an amenable number.

1011010021 is a deficient number, since it is larger than the sum of its proper divisors (174115739).

1011010021 is a wasteful number, since it uses less digits than its factorization.

1011010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4524.

The product of its (nonzero) digits is 2, while the sum is 7.

The square root of 1011010021 is about 31796.3837723726. The cubic root of 1011010021 is about 1003.6566198340.

Adding to 1011010021 its reverse (1200101101), we get a palindrome (2211111122).

The spelling of 1011010021 in words is "one billion, eleven million, ten thousand, twenty-one".