5561356421 has 4 divisors (see below), whose sum is σ = 5888495052. Its totient is φ = 5234217792.

The previous prime is 5561356403. The next prime is 5561356483. The reversal of 5561356421 is 1246531655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1246531655 = 5 ⋅249306331.

It can be written as a sum of positive squares in 2 ways, for example, as 3435132100 + 2126224321 = 58610^2 + 46111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5561356421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5561356121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163569290 + ... + 163569323.

It is an arithmetic number, because the mean of its divisors is an integer number (1472123763).

Almost surely, 2^5561356421 is an apocalyptic number.

It is an amenable number.

5561356421 is a deficient number, since it is larger than the sum of its proper divisors (327138631).

5561356421 is a wasteful number, since it uses less digits than its factorization.

5561356421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327138630.

The product of its digits is 108000, while the sum is 38.

The square root of 5561356421 is about 74574.5024857692. The cubic root of 5561356421 is about 1771.7138348150.

The spelling of 5561356421 in words is "five billion, five hundred sixty-one million, three hundred fifty-six thousand, four hundred twenty-one".