5621101021609 has 2 divisors, whose sum is σ = 5621101021610. Its totient is φ = 5621101021608.

The previous prime is 5621101021579. The next prime is 5621101021673. The reversal of 5621101021609 is 9061201011265.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4459023489600 + 1162077532009 = 2111640^2 + 1077997^2 .

It is a cyclic number.

It is not a de Polignac number, because 5621101021609 - 2¹¹ = 5621101019561 is a prime.

It is not a weakly prime, because it can be changed into another prime (5621101021309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2810550510804 + 2810550510805.

It is an arithmetic number, because the mean of its divisors is an integer number (2810550510805).

Almost surely, 2^{5621101021609} is an apocalyptic number.

It is an amenable number.

5621101021609 is a deficient number, since it is larger than the sum of its proper divisors (1).

5621101021609 is an equidigital number, since it uses as much as digits as its factorization.

5621101021609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 34.

The spelling of 5621101021609 in words is "five trillion, six hundred twenty-one billion, one hundred one million, twenty-one thousand, six hundred nine".