2621081321 has 2 divisors, whose sum is σ = 2621081322. Its totient is φ = 2621081320.

The previous prime is 2621081299. The next prime is 2621081327. The reversal of 2621081321 is 1231801262.

2621081321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2198203225 + 422878096 = 46885^2 + 20564^2 .

It is a cyclic number.

It is not a de Polignac number, because 2621081321 - 2²² = 2616887017 is a prime.

It is not a weakly prime, because it can be changed into another prime (2621081327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1310540660 + 1310540661.

It is an arithmetic number, because the mean of its divisors is an integer number (1310540661).

Almost surely, 2^2621081321 is an apocalyptic number.

It is an amenable number.

2621081321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2621081321 is an equidigital number, since it uses as much as digits as its factorization.

2621081321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 2621081321 is about 51196.4971555672. The cubic root of 2621081321 is about 1378.7753121570.

Adding to 2621081321 its reverse (1231801262), we get a palindrome (3852882583).

The spelling of 2621081321 in words is "two billion, six hundred twenty-one million, eighty-one thousand, three hundred twenty-one".