21202212122112 has 80 divisors (see below), whose sum is σ = 64553163725952. Its totient is φ = 6057774888960.

The previous prime is 21202212122071. The next prime is 21202212122167. The reversal of 21202212122112 is 21122121220212.

21202212122112 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×21202212122112³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 985955214 + ... + 985976717.

Almost surely, 2^{21202212122112} is an apocalyptic number.

It is an amenable number.

21202212122112 is an abundant number, since it is smaller than the sum of its proper divisors (43350951603840).

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

21202212122112 is an equidigital number, since it uses as much as digits as its factorization.

21202212122112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971931959 (or 1971931943 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21202212122112 its reverse (21122121220212), we get a palindrome (42324333342324).

The spelling of 21202212122112 in words is "twenty-one trillion, two hundred two billion, two hundred twelve million, one hundred twenty-two thousand, one hundred twelve".