21011022001212 has 24 divisors (see below), whose sum is σ = 49029095068800. Its totient is φ = 7003191562416.

The previous prime is 21011022001163. The next prime is 21011022001213. The reversal of 21011022001212 is 21210022011012.

It is a junction number, because it is equal to n+sod(n) for n = 21011022001191 and 21011022001200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011022001213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60123262 + ... + 60471717.

It is an arithmetic number, because the mean of its divisors is an integer number (2042878961200).

Almost surely, 2^{21011022001212} is an apocalyptic number.

It is an amenable number.

21011022001212 is an abundant number, since it is smaller than the sum of its proper divisors (28018073067588).

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

21011022001212 is a wasteful number, since it uses less digits than its factorization.

21011022001212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120609505 (or 120609503 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21011022001212 its reverse (21210022011012), we get a palindrome (42221044012224).

The spelling of 21011022001212 in words is "twenty-one trillion, eleven billion, twenty-two million, one thousand, two hundred twelve".