21101120212 has 12 divisors (see below), whose sum is σ = 37371864096. Its totient is φ = 10423444760.

The previous prime is 21101120203. The next prime is 21101120233. The reversal of 21101120212 is 21202110112.

It is a junction number, because it is equal to n+sod(n) for n = 21101120192 and 21101120201.

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, 31778464 + ... + 31779127.

It is an arithmetic number, because the mean of its divisors is an integer number (3114322008).

Almost surely, 2^21101120212 is an apocalyptic number.

It is an amenable number.

21101120212 is a deficient number, since it is larger than the sum of its proper divisors (16270743884).

21101120212 is a wasteful number, since it uses less digits than its factorization.

21101120212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63557678 (or 63557676 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21101120212 its reverse (21202110112), we get a palindrome (42303230324).

The spelling of 21101120212 in words is "twenty-one billion, one hundred one million, one hundred twenty thousand, two hundred twelve".