21121101001212 has 24 divisors (see below), whose sum is σ = 50981967934800. Its totient is φ = 6797595724416.

The previous prime is 21121101001199. The next prime is 21121101001213. The reversal of 21121101001212 is 21210010112112.

It is a happy number.

It is a super-2 number, since 2×21121101001212² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121101001191 and 21121101001200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121101001213) 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, 30346409137 + ... + 30346409832.

It is an arithmetic number, because the mean of its divisors is an integer number (2124248663950).

Almost surely, 2^{21121101001212} is an apocalyptic number.

It is an amenable number.

21121101001212 is an abundant number, since it is smaller than the sum of its proper divisors (29860866933588).

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

21121101001212 is a wasteful number, since it uses less digits than its factorization.

21121101001212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60692819005 (or 60692819003 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21121101001212 its reverse (21210010112112), we get a palindrome (42331111113324).

The spelling of 21121101001212 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred one million, one thousand, two hundred twelve".