21101101001212 has 12 divisors (see below), whose sum is σ = 36951726579040. Its totient is φ = 10543464835776.

The previous prime is 21101101001207. The next prime is 21101101001249. The reversal of 21101101001212 is 21210010110112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21101101001192 and 21101101001201.

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, 1771409508 + ... + 1771421419.

Almost surely, 2^{21101101001212} is an apocalyptic number.

It is an amenable number.

21101101001212 is a deficient number, since it is larger than the sum of its proper divisors (15850625577828).

21101101001212 is a wasteful number, since it uses less digits than its factorization.

21101101001212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3542832420 (or 3542832418 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21101101001212 its reverse (21210010110112), we get a palindrome (42311111111324).

The spelling of 21101101001212 in words is "twenty-one trillion, one hundred one billion, one hundred one million, one thousand, two hundred twelve".