21152553035555 has 8 divisors (see below), whose sum is σ = 25383179489712. Its totient is φ = 16921965197088.

The previous prime is 21152553035539. The next prime is 21152553035567. The reversal of 21152553035555 is 55553035525112.

It is a happy number.

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 21152553035555 - 2⁴ = 21152553035539 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8434829 + ... + 10651358.

It is an arithmetic number, because the mean of its divisors is an integer number (3172897436214).

Almost surely, 2^{21152553035555} is an apocalyptic number.

21152553035555 is a deficient number, since it is larger than the sum of its proper divisors (4230626454157).

21152553035555 is a wasteful number, since it uses less digits than its factorization.

21152553035555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19307845.

The product of its (nonzero) digits is 2812500, while the sum is 47.

The spelling of 21152553035555 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred fifty-three million, thirty-five thousand, five hundred fifty-five".