30021821553 has 4 divisors (see below), whose sum is σ = 40029095408. Its totient is φ = 20014547700.

The previous prime is 30021821527. The next prime is 30021821561. The reversal of 30021821553 is 35512812003.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 30021821553 - 2⁵ = 30021821521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30021821553.

It is not an unprimeable number, because it can be changed into a prime (30021821513) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5003636923 + ... + 5003636928.

It is an arithmetic number, because the mean of its divisors is an integer number (10007273852).

Almost surely, 2^30021821553 is an apocalyptic number.

It is an amenable number.

30021821553 is a deficient number, since it is larger than the sum of its proper divisors (10007273855).

30021821553 is a wasteful number, since it uses less digits than its factorization.

30021821553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10007273854.

The product of its (nonzero) digits is 7200, while the sum is 30.

The spelling of 30021821553 in words is "thirty billion, twenty-one million, eight hundred twenty-one thousand, five hundred fifty-three".