21012012222111 has 8 divisors (see below), whose sum is σ = 31128906995760. Its totient is φ = 14008008148056.

The previous prime is 21012012222073. The next prime is 21012012222143. The reversal of 21012012222111 is 11122221021012.

21012012222111 is a `hidden beast` number, since 210 + 1 + 20 + 1 + 222 + 211 + 1 = 666.

It is not a de Polignac number, because 21012012222111 - 2¹¹ = 21012012220063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012012222511) 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 7 ways as a sum of consecutive naturals, for example, 389111337420 + ... + 389111337473.

It is an arithmetic number, because the mean of its divisors is an integer number (3891113374470).

Almost surely, 2^{21012012222111} is an apocalyptic number.

21012012222111 is a deficient number, since it is larger than the sum of its proper divisors (10116894773649).

21012012222111 is an equidigital number, since it uses as much as digits as its factorization.

21012012222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778222674902 (or 778222674896 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21012012222111 its reverse (11122221021012), we get a palindrome (32134233243123).

The spelling of 21012012222111 in words is "twenty-one trillion, twelve billion, twelve million, two hundred twenty-two thousand, one hundred eleven".