2201020621 has 2 divisors, whose sum is σ = 2201020622. Its totient is φ = 2201020620.

The previous prime is 2201020609. The next prime is 2201020687. The reversal of 2201020621 is 1260201022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1827990025 + 373030596 = 42755^2 + 19314^2 .

It is a cyclic number.

It is not a de Polignac number, because 2201020621 - 2¹⁵ = 2200987853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2201020595 and 2201020604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2201020691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1100510310 + 1100510311.

It is an arithmetic number, because the mean of its divisors is an integer number (1100510311).

Almost surely, 2^2201020621 is an apocalyptic number.

It is an amenable number.

2201020621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2201020621 is an equidigital number, since it uses as much as digits as its factorization.

2201020621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2201020621 is about 46915.0361931012. The cubic root of 2201020621 is about 1300.7925386280.

Adding to 2201020621 its reverse (1260201022), we get a palindrome (3461221643).

The spelling of 2201020621 in words is "two billion, two hundred one million, twenty thousand, six hundred twenty-one".