22002021 has 6 divisors (see below), whose sum is σ = 31780710. Its totient is φ = 14668008.

The previous prime is 22002011. The next prime is 22002023. The reversal of 22002021 is 12020022.

It can be written as a sum of positive squares in only one way, i.e., 13793796 + 8208225 = 3714^2 + 2865^2 .

It is not a de Polignac number, because 22002021 - 2⁵ = 22001989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2444669 = 22002021 / (2 + 2 + 0 + 0 + 2 + 0 + 2 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 22001994 and 22002012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22002023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1222326 + ... + 1222343.

It is an arithmetic number, because the mean of its divisors is an integer number (5296785).

Almost surely, 2^22002021 is an apocalyptic number.

It is an amenable number.

22002021 is a deficient number, since it is larger than the sum of its proper divisors (9778689).

22002021 is a wasteful number, since it uses less digits than its factorization.

22002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2444675 (or 2444672 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 22002021 is about 4690.6311941998. The cubic root of 22002021 is about 280.2125129869.

Adding to 22002021 its reverse (12020022), we get a palindrome (34022043).

The spelling of 22002021 in words is "twenty-two million, two thousand, twenty-one".