21534350214545 has 16 divisors (see below), whose sum is σ = 29803766488320. Its totient is φ = 14630939907264.

The previous prime is 21534350214541. The next prime is 21534350214569. The reversal of 21534350214545 is 54541205343512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21534350214545 - 2² = 21534350214541 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21534350214496 and 21534350214505.

It is not an unprimeable number, because it can be changed into a prime (21534350214541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2822322557 + ... + 2822330186.

It is an arithmetic number, because the mean of its divisors is an integer number (1862735405520).

Almost surely, 2^{21534350214545} is an apocalyptic number.

It is an amenable number.

21534350214545 is a deficient number, since it is larger than the sum of its proper divisors (8269416273775).

21534350214545 is a wasteful number, since it uses less digits than its factorization.

21534350214545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5644652864.

The product of its (nonzero) digits is 1440000, while the sum is 44.

The spelling of 21534350214545 in words is "twenty-one trillion, five hundred thirty-four billion, three hundred fifty million, two hundred fourteen thousand, five hundred forty-five".