1010921 has 4 divisors (see below), whose sum is σ = 1013844. Its totient is φ = 1008000.

The previous prime is 1010917. The next prime is 1010929. The reversal of 1010921 is 1290101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1290101 = 419 ⋅3079.

It can be written as a sum of positive squares in 2 ways, for example, as 469225 + 541696 = 685^2 + 736^2 .

It is a cyclic number.

It is not a de Polignac number, because 1010921 - 2² = 1010917 is a prime.

It is a super-2 number, since 2×1010921² = 2043922536482, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

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 = 1010896 and 1010905.

It is not an unprimeable number, because it can be changed into a prime (1010929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 860 + ... + 1661.

It is an arithmetic number, because the mean of its divisors is an integer number (253461).

2^1010921 is an apocalyptic number.

It is an amenable number.

1010921 is a deficient number, since it is larger than the sum of its proper divisors (2923).

1010921 is an equidigital number, since it uses as much as digits as its factorization.

1010921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2922.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1010921 is about 1005.4456723265. The cubic root of 1010921 is about 100.3627161129.

The spelling of 1010921 in words is "one million, ten thousand, nine hundred twenty-one".