21555301152 has 96 divisors (see below), whose sum is σ = 70544646144. Its totient is φ = 5598777600.

The previous prime is 21555301099. The next prime is 21555301153. The reversal of 21555301152 is 25110355512.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (21555301153) 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, 1450624 + ... + 1465407.

It is an arithmetic number, because the mean of its divisors is an integer number (734840064).

Almost surely, 2^21555301152 is an apocalyptic number.

21555301152 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21555301152 is an abundant number, since it is smaller than the sum of its proper divisors (48989344992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21555301152 is a wasteful number, since it uses less digits than its factorization.

21555301152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2916062 (or 2916054 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 30.

Adding to 21555301152 its reverse (25110355512), we get a palindrome (46665656664).

The spelling of 21555301152 in words is "twenty-one billion, five hundred fifty-five million, three hundred one thousand, one hundred fifty-two".