2001420221 has 2 divisors, whose sum is σ = 2001420222. Its totient is φ = 2001420220.

The previous prime is 2001420209. The next prime is 2001420241. The reversal of 2001420221 is 1220241002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1731475321 + 269944900 = 41611^2 + 16430^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001420221 - 2¹⁴ = 2001403837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001420196 and 2001420205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001420241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000710110 + 1000710111.

It is an arithmetic number, because the mean of its divisors is an integer number (1000710111).

Almost surely, 2^2001420221 is an apocalyptic number.

It is an amenable number.

2001420221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001420221 is an equidigital number, since it uses as much as digits as its factorization.

2001420221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 2001420221 is about 44737.2352856097. The cubic root of 2001420221 is about 1260.2192070534.

Adding to 2001420221 its reverse (1220241002), we get a palindrome (3221661223).

The spelling of 2001420221 in words is "two billion, one million, four hundred twenty thousand, two hundred twenty-one".