21112221021012 has 36 divisors (see below), whose sum is σ = 58218548877216. Its totient is φ = 6397642733520.

The previous prime is 21112221020993. The next prime is 21112221021061. The reversal of 21112221021012 is 21012012221112.

21112221021012 is a `hidden beast` number, since 211 + 1 + 22 + 210 + 210 + 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 a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 26656844328 + ... + 26656845119.

It is an arithmetic number, because the mean of its divisors is an integer number (1617181913256).

Almost surely, 2^{21112221021012} is an apocalyptic number.

21112221021012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21112221021012 is an abundant number, since it is smaller than the sum of its proper divisors (37106327856204).

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

21112221021012 is a wasteful number, since it uses less digits than its factorization.

21112221021012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53313689468 (or 53313689463 counting only the distinct ones).

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

Adding to 21112221021012 its reverse (21012012221112), we get a palindrome (42124233242124).

The spelling of 21112221021012 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-one million, twenty-one thousand, twelve".