21554352322123 has 2 divisors, whose sum is σ = 21554352322124. Its totient is φ = 21554352322122.

The previous prime is 21554352322037. The next prime is 21554352322219. The reversal of 21554352322123 is 32122325345512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21554352322123 - 2¹³ = 21554352313931 is a prime.

It is not a weakly prime, because it can be changed into another prime (21554356322123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10777176161061 + 10777176161062.

It is an arithmetic number, because the mean of its divisors is an integer number (10777176161062).

Almost surely, 2^{21554352322123} is an apocalyptic number.

21554352322123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21554352322123 is an equidigital number, since it uses as much as digits as its factorization.

21554352322123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432000, while the sum is 40.

Adding to 21554352322123 its reverse (32122325345512), we get a palindrome (53676677667635).

The spelling of 21554352322123 in words is "twenty-one trillion, five hundred fifty-four billion, three hundred fifty-two million, three hundred twenty-two thousand, one hundred twenty-three".