1001122021 has 4 divisors (see below), whose sum is σ = 1035643500. Its totient is φ = 966600544.

The previous prime is 1001122009. The next prime is 1001122097. The reversal of 1001122021 is 1202211001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 565773796 + 435348225 = 23786^2 + 20865^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001122021 - 2¹⁵ = 1001089253 is a prime.

It is a super-2 number, since 2×1001122021² = 2004490601862248882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001121989 and 1001122007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001122121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17260696 + ... + 17260753.

It is an arithmetic number, because the mean of its divisors is an integer number (258910875).

Almost surely, 2^1001122021 is an apocalyptic number.

It is an amenable number.

1001122021 is a deficient number, since it is larger than the sum of its proper divisors (34521479).

1001122021 is an equidigital number, since it uses as much as digits as its factorization.

1001122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34521478.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1001122021 is about 31640.5123378241. The cubic root of 1001122021 is about 1000.3738672059.

Adding to 1001122021 its reverse (1202211001), we get a palindrome (2203333022).

The spelling of 1001122021 in words is "one billion, one million, one hundred twenty-two thousand, twenty-one".