21355553452 has 48 divisors (see below), whose sum is σ = 39397881600. Its totient is φ = 10108978880.

The previous prime is 21355553441. The next prime is 21355553467. The reversal of 21355553452 is 25435555312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5047674 + ... + 5051902.

It is an arithmetic number, because the mean of its divisors is an integer number (820789200).

Almost surely, 2^21355553452 is an apocalyptic number.

It is an amenable number.

21355553452 is a deficient number, since it is larger than the sum of its proper divisors (18042328148).

21355553452 is a wasteful number, since it uses less digits than its factorization.

21355553452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4806 (or 4804 counting only the distinct ones).

The product of its digits is 450000, while the sum is 40.

The spelling of 21355553452 in words is "twenty-one billion, three hundred fifty-five million, five hundred fifty-three thousand, four hundred fifty-two".