5621658121 has 2 divisors, whose sum is σ = 5621658122. Its totient is φ = 5621658120.

The previous prime is 5621658083. The next prime is 5621658139. The reversal of 5621658121 is 1218561265.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4714744896 + 906913225 = 68664^2 + 30115^2 .

It is a cyclic number.

It is not a de Polignac number, because 5621658121 - 2¹⁵ = 5621625353 is a prime.

It is not a weakly prime, because it can be changed into another prime (5621658221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2810829060 + 2810829061.

It is an arithmetic number, because the mean of its divisors is an integer number (2810829061).

Almost surely, 2^5621658121 is an apocalyptic number.

It is an amenable number.

5621658121 is a deficient number, since it is larger than the sum of its proper divisors (1).

5621658121 is an equidigital number, since it uses as much as digits as its factorization.

5621658121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 37.

The square root of 5621658121 is about 74977.7174966003. The cubic root of 5621658121 is about 1778.0943837464.

The spelling of 5621658121 in words is "five billion, six hundred twenty-one million, six hundred fifty-eight thousand, one hundred twenty-one".