1000022021 has 4 divisors (see below), whose sum is σ = 1024412844. Its totient is φ = 975631200.

The previous prime is 1000021987. The next prime is 1000022027. The reversal of 1000022021 is 1202200001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1202200001 = 769 ⋅1563329.

It can be written as a sum of positive squares in 2 ways, for example, as 36602500 + 963419521 = 6050^2 + 31039^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000022021 - 2¹⁰ = 1000020997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000022027) 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, 12195350 + ... + 12195431.

It is an arithmetic number, because the mean of its divisors is an integer number (256103211).

Almost surely, 2^1000022021 is an apocalyptic number.

It is an amenable number.

1000022021 is a deficient number, since it is larger than the sum of its proper divisors (24390823).

1000022021 is an equidigital number, since it uses as much as digits as its factorization.

1000022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24390822.

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

The square root of 1000022021 is about 31623.1247823488. The cubic root of 1000022021 is about 1000.0073402795.

Adding to 1000022021 its reverse (1202200001), we get a palindrome (2202222022).

The spelling of 1000022021 in words is "one billion, twenty-two thousand, twenty-one".