2601242221 has 2 divisors, whose sum is σ = 2601242222. Its totient is φ = 2601242220.

The previous prime is 2601242219. The next prime is 2601242239. The reversal of 2601242221 is 1222421062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1448639721 + 1152602500 = 38061^2 + 33950^2 .

It is a cyclic number.

It is not a de Polignac number, because 2601242221 - 2¹ = 2601242219 is a prime.

It is a super-2 number, since 2×2601242221² = 13532922184626025682, which contains 22 as substring.

Together with 2601242219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2601242192 and 2601242201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2601242251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1300621110 + 1300621111.

It is an arithmetic number, because the mean of its divisors is an integer number (1300621111).

Almost surely, 2^2601242221 is an apocalyptic number.

It is an amenable number.

2601242221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2601242221 is an equidigital number, since it uses as much as digits as its factorization.

2601242221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 2601242221 is about 51002.3746604018. The cubic root of 2601242221 is about 1375.2878244406.

Adding to 2601242221 its reverse (1222421062), we get a palindrome (3823663283).

The spelling of 2601242221 in words is "two billion, six hundred one million, two hundred forty-two thousand, two hundred twenty-one".