21553552848 has 40 divisors (see below), whose sum is σ = 55685845600. Its totient is φ = 7183764864.

The previous prime is 21553552831. The next prime is 21553552849. The reversal of 21553552848 is 84825535512.

It is a happy number.

It is a super-2 number, since 2×21553552848² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 21553552797 and 21553552806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21553552849) 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, 621963 + ... + 655701.

It is an arithmetic number, because the mean of its divisors is an integer number (1392146140).

Almost surely, 2^21553552848 is an apocalyptic number.

It is an amenable number.

21553552848 is an abundant number, since it is smaller than the sum of its proper divisors (34132292752).

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

21553552848 is a wasteful number, since it uses less digits than its factorization.

21553552848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47059 (or 47053 counting only the distinct ones).

The product of its digits is 1920000, while the sum is 48.

The spelling of 21553552848 in words is "twenty-one billion, five hundred fifty-three million, five hundred fifty-two thousand, eight hundred forty-eight".