21100022012 has 12 divisors (see below), whose sum is σ = 36950997216. Its totient is φ = 10542594240.

The previous prime is 21100021993. The next prime is 21100022023. The reversal of 21100022012 is 21022000112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21100021984 and 21100022002.

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, 1847789 + ... + 1859172.

It is an arithmetic number, because the mean of its divisors is an integer number (3079249768).

Almost surely, 2^21100022012 is an apocalyptic number.

It is an amenable number.

21100022012 is a deficient number, since it is larger than the sum of its proper divisors (15850975204).

21100022012 is a wasteful number, since it uses less digits than its factorization.

21100022012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3708388 (or 3708386 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21100022012 its reverse (21022000112), we get a palindrome (42122022124).

The spelling of 21100022012 in words is "twenty-one billion, one hundred million, twenty-two thousand, twelve".