21300220221 has 16 divisors (see below), whose sum is σ = 32611312128. Its totient is φ = 12113866800.

The previous prime is 21300220217. The next prime is 21300220241. The reversal of 21300220221 is 12202200312.

It is a happy number.

It is not a de Polignac number, because 21300220221 - 2² = 21300220217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21300220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300220241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2399115 + ... + 2407976.

It is an arithmetic number, because the mean of its divisors is an integer number (2038207008).

Almost surely, 2^21300220221 is an apocalyptic number.

21300220221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21300220221 is a deficient number, since it is larger than the sum of its proper divisors (11311091907).

21300220221 is a wasteful number, since it uses less digits than its factorization.

21300220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4807312.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21300220221 its reverse (12202200312), we get a palindrome (33502420533).

The spelling of 21300220221 in words is "twenty-one billion, three hundred million, two hundred twenty thousand, two hundred twenty-one".