21552153243551 has 8 divisors (see below), whose sum is σ = 24684929508000. Its totient is φ = 18432851286528.

The previous prime is 21552153243503. The next prime is 21552153243581. The reversal of 21552153243551 is 15534235125512.

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

It is not a de Polignac number, because 21552153243551 - 2²² = 21552149049247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21552153243581) 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, 3368573426 + ... + 3368579823.

It is an arithmetic number, because the mean of its divisors is an integer number (3085616188500).

Almost surely, 2^{21552153243551} is an apocalyptic number.

21552153243551 is a deficient number, since it is larger than the sum of its proper divisors (3132776264449).

21552153243551 is an equidigital number, since it uses as much as digits as its factorization.

21552153243551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6737153713.

The product of its digits is 900000, while the sum is 44.

The spelling of 21552153243551 in words is "twenty-one trillion, five hundred fifty-two billion, one hundred fifty-three million, two hundred forty-three thousand, five hundred fifty-one".