21002113101212 has 12 divisors (see below), whose sum is σ = 38688103081320. Its totient is φ = 9948369363696.

The previous prime is 21002113101163. The next prime is 21002113101241. The reversal of 21002113101212 is 21210131120012.

It is a happy number.

It is a super-2 number, since 2×21002113101212² (a number of 27 digits) contains 22 as substring.

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, 138171796643 + ... + 138171796794.

It is an arithmetic number, because the mean of its divisors is an integer number (3224008590110).

Almost surely, 2^{21002113101212} is an apocalyptic number.

It is an amenable number.

21002113101212 is a deficient number, since it is larger than the sum of its proper divisors (17685989980108).

21002113101212 is a wasteful number, since it uses less digits than its factorization.

21002113101212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276343593460 (or 276343593458 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21002113101212 its reverse (21210131120012), we get a palindrome (42212244221224).

The spelling of 21002113101212 in words is "twenty-one trillion, two billion, one hundred thirteen million, one hundred one thousand, two hundred twelve".