21551545051543 has 8 divisors (see below), whose sum is σ = 23283984368736. Its totient is φ = 19829766900000.

The previous prime is 21551545051529. The next prime is 21551545051559. The reversal of 21551545051543 is 34515054515512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21551545051543 - 2³³ = 21542955116951 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21551545051493 and 21551545051502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21551545051343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2665287208 + ... + 2665295293.

It is an arithmetic number, because the mean of its divisors is an integer number (2910498046092).

Almost surely, 2^{21551545051543} is an apocalyptic number.

21551545051543 is a deficient number, since it is larger than the sum of its proper divisors (1732439317193).

21551545051543 is a wasteful number, since it uses less digits than its factorization.

21551545051543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5330582825.

The product of its (nonzero) digits is 1500000, while the sum is 46.

The spelling of 21551545051543 in words is "twenty-one trillion, five hundred fifty-one billion, five hundred forty-five million, fifty-one thousand, five hundred forty-three".