21550300434623 has 2 divisors, whose sum is σ = 21550300434624. Its totient is φ = 21550300434622.

The previous prime is 21550300434587. The next prime is 21550300434631. The reversal of 21550300434623 is 32643400305512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21550300434623 - 2⁸ = 21550300434367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21550350434623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10775150217311 + 10775150217312.

It is an arithmetic number, because the mean of its divisors is an integer number (10775150217312).

Almost surely, 2^{21550300434623} is an apocalyptic number.

21550300434623 is a deficient number, since it is larger than the sum of its proper divisors (1).

21550300434623 is an equidigital number, since it uses as much as digits as its factorization.

21550300434623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 38.

The spelling of 21550300434623 in words is "twenty-one trillion, five hundred fifty billion, three hundred million, four hundred thirty-four thousand, six hundred twenty-three".