21020101121212 has 24 divisors (see below), whose sum is σ = 36843202444496. Its totient is φ = 10493472578688.

The previous prime is 21020101121183. The next prime is 21020101121221. The reversal of 21020101121212 is 21212110102012.

It is a super-2 number, since 2×21020101121212² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217792438 + ... + 217888930.

Almost surely, 2^{21020101121212} is an apocalyptic number.

It is an amenable number.

21020101121212 is a deficient number, since it is larger than the sum of its proper divisors (15823101323284).

21020101121212 is a wasteful number, since it uses less digits than its factorization.

21020101121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181837 (or 181835 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21020101121212 its reverse (21212110102012), we get a palindrome (42232211223224).

The spelling of 21020101121212 in words is "twenty-one trillion, twenty billion, one hundred one million, one hundred twenty-one thousand, two hundred twelve".