21112221111012 has 36 divisors (see below), whose sum is σ = 53367204945600. Its totient is φ = 7037380454832.

The previous prime is 21112221110999. The next prime is 21112221111013. The reversal of 21112221111012 is 21011112221112.

It is a happy number.

21112221111012 is a `hidden beast` number, since 211 + 122 + 211 + 110 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21112221111013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10112473 + ... + 12020255.

It is an arithmetic number, because the mean of its divisors is an integer number (1482422359600).

Almost surely, 2^{21112221111012} is an apocalyptic number.

It is an amenable number.

21112221111012 is an abundant number, since it is smaller than the sum of its proper divisors (32254983834588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21112221111012 is a wasteful number, since it uses less digits than its factorization.

21112221111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215192 (or 2215187 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21112221111012 its reverse (21011112221112), we get a palindrome (42123333332124).

The spelling of 21112221111012 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-one million, one hundred eleven thousand, twelve".