221030300021 has 4 divisors (see below), whose sum is σ = 223828152000. Its totient is φ = 218232448044.

The previous prime is 221030300011. The next prime is 221030300147. The reversal of 221030300021 is 120003030122.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 221030300021 - 2¹⁰ = 221030298997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221030299969 and 221030300005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221030300011) 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, 1398925871 + ... + 1398926028.

It is an arithmetic number, because the mean of its divisors is an integer number (55957038000).

Almost surely, 2^221030300021 is an apocalyptic number.

It is an amenable number.

221030300021 is a deficient number, since it is larger than the sum of its proper divisors (2797851979).

221030300021 is an equidigital number, since it uses as much as digits as its factorization.

221030300021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2797851978.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 221030300021 its reverse (120003030122), we get a palindrome (341033330143).

The spelling of 221030300021 in words is "two hundred twenty-one billion, thirty million, three hundred thousand, twenty-one".