21200220111 has 32 divisors (see below), whose sum is σ = 33073735680. Its totient is φ = 11827443456.

The previous prime is 21200220101. The next prime is 21200220113. The reversal of 21200220111 is 11102200212.

It is not a de Polignac number, because 21200220111 - 2⁷ = 21200219983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200220113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 377425 + ... + 429941.

It is an arithmetic number, because the mean of its divisors is an integer number (1033554240).

Almost surely, 2^21200220111 is an apocalyptic number.

21200220111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21200220111 is a deficient number, since it is larger than the sum of its proper divisors (11873515569).

21200220111 is a wasteful number, since it uses less digits than its factorization.

21200220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52983.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21200220111 its reverse (11102200212), we get a palindrome (32302420323).

The spelling of 21200220111 in words is "twenty-one billion, two hundred million, two hundred twenty thousand, one hundred eleven".