55451353021 has 2 divisors, whose sum is σ = 55451353022. Its totient is φ = 55451353020.

The previous prime is 55451352973. The next prime is 55451353037. The reversal of 55451353021 is 12035315455.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39509512900 + 15941840121 = 198770^2 + 126261^2 .

It is a cyclic number.

It is not a de Polignac number, because 55451353021 - 2¹¹ = 55451350973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55451353051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27725676510 + 27725676511.

It is an arithmetic number, because the mean of its divisors is an integer number (27725676511).

Almost surely, 2^55451353021 is an apocalyptic number.

It is an amenable number.

55451353021 is a deficient number, since it is larger than the sum of its proper divisors (1).

55451353021 is an equidigital number, since it uses as much as digits as its factorization.

55451353021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45000, while the sum is 34.

Adding to 55451353021 its reverse (12035315455), we get a palindrome (67486668476).

The spelling of 55451353021 in words is "fifty-five billion, four hundred fifty-one million, three hundred fifty-three thousand, twenty-one".