5621907121 has 2 divisors, whose sum is σ = 5621907122. Its totient is φ = 5621907120.

The previous prime is 5621907113. The next prime is 5621907173. The reversal of 5621907121 is 1217091265.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5619151521 + 2755600 = 74961^2 + 1660^2 .

It is a cyclic number.

It is not a de Polignac number, because 5621907121 - 2³ = 5621907113 is a prime.

It is not a weakly prime, because it can be changed into another prime (5621907521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2810953560 + 2810953561.

It is an arithmetic number, because the mean of its divisors is an integer number (2810953561).

Almost surely, 2^5621907121 is an apocalyptic number.

It is an amenable number.

5621907121 is a deficient number, since it is larger than the sum of its proper divisors (1).

5621907121 is an equidigital number, since it uses as much as digits as its factorization.

5621907121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 5621907121 is about 74979.3779715463. The cubic root of 5621907121 is about 1778.1206357261.

Adding to 5621907121 its reverse (1217091265), we get a palindrome (6838998386).

The spelling of 5621907121 in words is "five billion, six hundred twenty-one million, nine hundred seven thousand, one hundred twenty-one".