21112201012212 has 72 divisors (see below), whose sum is σ = 54149001608520. Its totient is φ = 6934454737920.

The previous prime is 21112201012169. The next prime is 21112201012249. The reversal of 21112201012212 is 21221010221112.

21112201012212 is a `hidden beast` number, since 211 + 1 + 220 + 10 + 1 + 221 + 2 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 10514480700816 + 10597720311396 = 3242604^2 + 3255414^2 .

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 polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 997537 + ... + 6574152.

It is an arithmetic number, because the mean of its divisors is an integer number (752069466785).

Almost surely, 2^{21112201012212} is an apocalyptic number.

It is an amenable number.

21112201012212 is an abundant number, since it is smaller than the sum of its proper divisors (33036800596308).

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

21112201012212 is a wasteful number, since it uses less digits than its factorization.

21112201012212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7572833 (or 7572828 counting only the distinct ones).

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

Adding to 21112201012212 its reverse (21221010221112), we get a palindrome (42333211233324).

The spelling of 21112201012212 in words is "twenty-one trillion, one hundred twelve billion, two hundred one million, twelve thousand, two hundred twelve".