21101110201212 has 12 divisors (see below), whose sum is σ = 49235923802856. Its totient is φ = 7033703400400.

The previous prime is 21101110201139. The next prime is 21101110201229. The reversal of 21101110201212 is 21210201110112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21101110201212² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21101110201191 and 21101110201200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 879212925039 + ... + 879212925062.

It is an arithmetic number, because the mean of its divisors is an integer number (4102993650238).

Almost surely, 2^{21101110201212} is an apocalyptic number.

It is an amenable number.

21101110201212 is an abundant number, since it is smaller than the sum of its proper divisors (28134813601644).

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

21101110201212 is a wasteful number, since it uses less digits than its factorization.

21101110201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758425850108 (or 1758425850106 counting only the distinct ones).

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

Adding to 21101110201212 its reverse (21210201110112), we get a palindrome (42311311311324).

The spelling of 21101110201212 in words is "twenty-one trillion, one hundred one billion, one hundred ten million, two hundred one thousand, two hundred twelve".