21545553055001 has 16 divisors (see below), whose sum is σ = 23064654182400. Its totient is φ = 20064986170128.

The previous prime is 21545553054967. The next prime is 21545553055031. The reversal of 21545553055001 is 10055035554512.

It is a cyclic number.

It is not a de Polignac number, because 21545553055001 - 2¹⁰ = 21545553053977 is a prime.

It is a super-2 number, since 2×21545553055001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21545553055001.

It is not an unprimeable number, because it can be changed into a prime (21545553055031) 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, 37432676 + ... + 38003898.

It is an arithmetic number, because the mean of its divisors is an integer number (1441540886400).

Almost surely, 2^{21545553055001} is an apocalyptic number.

It is an amenable number.

21545553055001 is a deficient number, since it is larger than the sum of its proper divisors (1519101127399).

21545553055001 is a wasteful number, since it uses less digits than its factorization.

21545553055001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604948.

The product of its (nonzero) digits is 375000, while the sum is 41.

The spelling of 21545553055001 in words is "twenty-one trillion, five hundred forty-five billion, five hundred fifty-three million, fifty-five thousand, one".