21111201013212 has 72 divisors (see below), whose sum is σ = 54194832780816. Its totient is φ = 6927694228224.

The previous prime is 21111201013187. The next prime is 21111201013247. The reversal of 21111201013212 is 21231010211112.

It is a happy number.

21111201013212 is a `hidden beast` number, since 211 + 1 + 120 + 10 + 1 + 321 + 2 = 666.

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, 1111648 + ... + 6592280.

Almost surely, 2^{21111201013212} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21111201013212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27097416390408).

21111201013212 is an abundant number, since it is smaller than the sum of its proper divisors (33083631767604).

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

21111201013212 is a wasteful number, since it uses less digits than its factorization.

21111201013212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5482307 (or 5482302 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 21111201013212 its reverse (21231010211112), we get a palindrome (42342211224324).

The spelling of 21111201013212 in words is "twenty-one trillion, one hundred eleven billion, two hundred one million, thirteen thousand, two hundred twelve".