2201021021 has 2 divisors, whose sum is σ = 2201021022. Its totient is φ = 2201021020.

The previous prime is 2201021003. The next prime is 2201021023. The reversal of 2201021021 is 1201201022.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2123827225 + 77193796 = 46085^2 + 8786^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2201021021 is a prime.

Together with 2201021023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2201020993 and 2201021011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2201021023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1100510510 + 1100510511.

It is an arithmetic number, because the mean of its divisors is an integer number (1100510511).

Almost surely, 2^2201021021 is an apocalyptic number.

It is an amenable number.

2201021021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2201021021 is an equidigital number, since it uses as much as digits as its factorization.

2201021021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2201021021 is about 46915.0404561266. The cubic root of 2201021021 is about 1300.7926174274.

Adding to 2201021021 its reverse (1201201022), we get a palindrome (3402222043).

The spelling of 2201021021 in words is "two billion, two hundred one million, twenty-one thousand, twenty-one".