21220002111 has 32 divisors (see below), whose sum is σ = 35362930176. Its totient is φ = 10995840000.

The previous prime is 21220002073. The next prime is 21220002113. The reversal of 21220002111 is 11120002212.

It is not a de Polignac number, because 21220002111 - 2²¹ = 21217904959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220002113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21910 + ... + 207171.

It is an arithmetic number, because the mean of its divisors is an integer number (1105091568).

Almost surely, 2^21220002111 is an apocalyptic number.

21220002111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21220002111 is a deficient number, since it is larger than the sum of its proper divisors (14142928065).

21220002111 is a wasteful number, since it uses less digits than its factorization.

21220002111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229503.

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

Adding to 21220002111 its reverse (11120002212), we get a palindrome (32340004323).

The spelling of 21220002111 in words is "twenty-one billion, two hundred twenty million, two thousand, one hundred eleven".