5531020421 has 2 divisors, whose sum is σ = 5531020422. Its totient is φ = 5531020420.

The previous prime is 5531020373. The next prime is 5531020457. The reversal of 5531020421 is 1240201355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5471560900 + 59459521 = 73970^2 + 7711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5531020421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5531020471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2765510210 + 2765510211.

It is an arithmetic number, because the mean of its divisors is an integer number (2765510211).

Almost surely, 2^5531020421 is an apocalyptic number.

It is an amenable number.

5531020421 is a deficient number, since it is larger than the sum of its proper divisors (1).

5531020421 is an equidigital number, since it uses as much as digits as its factorization.

5531020421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 5531020421 is about 74370.8304444693. The cubic root of 5531020421 is about 1768.4865206119.

Adding to 5531020421 its reverse (1240201355), we get a palindrome (6771221776).

The spelling of 5531020421 in words is "five billion, five hundred thirty-one million, twenty thousand, four hundred twenty-one".