21183553147 has 4 divisors (see below), whose sum is σ = 21206807136. Its totient is φ = 21160299160.

The previous prime is 21183553141. The next prime is 21183553211. The reversal of 21183553147 is 74135538112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21183553147 - 2⁷ = 21183553019 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21183553141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11625628 + ... + 11627449.

It is an arithmetic number, because the mean of its divisors is an integer number (5301701784).

Almost surely, 2^21183553147 is an apocalyptic number.

21183553147 is a deficient number, since it is larger than the sum of its proper divisors (23253989).

21183553147 is an equidigital number, since it uses as much as digits as its factorization.

21183553147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23253988.

The product of its digits is 100800, while the sum is 40.

The spelling of 21183553147 in words is "twenty-one billion, one hundred eighty-three million, five hundred fifty-three thousand, one hundred forty-seven".