21454554335505 has 16 divisors (see below), whose sum is σ = 34394727591360. Its totient is φ = 11419948760768.

The previous prime is 21454554335503. The next prime is 21454554335519. The reversal of 21454554335505 is 50553345545412.

It is a cyclic number.

It is not a de Polignac number, because 21454554335505 - 2¹ = 21454554335503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21454554335503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1405005747 + ... + 1405021016.

It is an arithmetic number, because the mean of its divisors is an integer number (2149670474460).

Almost surely, 2^{21454554335505} is an apocalyptic number.

It is an amenable number.

21454554335505 is a deficient number, since it is larger than the sum of its proper divisors (12940173255855).

21454554335505 is a wasteful number, since it uses less digits than its factorization.

21454554335505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2810027280.

The product of its (nonzero) digits is 18000000, while the sum is 51.

The spelling of 21454554335505 in words is "twenty-one trillion, four hundred fifty-four billion, five hundred fifty-four million, three hundred thirty-five thousand, five hundred five".