21110021000212 has 24 divisors (see below), whose sum is σ = 38397537833760. Its totient is φ = 10142745819360.

The previous prime is 21110021000209. The next prime is 21110021000227. The reversal of 21110021000212 is 21200012001112.

It is a junction number, because it is equal to n+sod(n) for n = 21110021000192 and 21110021000201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 431214718 + ... + 431263669.

It is an arithmetic number, because the mean of its divisors is an integer number (1599897409740).

Almost surely, 2^{21110021000212} is an apocalyptic number.

It is an amenable number.

21110021000212 is a deficient number, since it is larger than the sum of its proper divisors (17287516833548).

21110021000212 is a wasteful number, since it uses less digits than its factorization.

21110021000212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862478631 (or 862478629 counting only the distinct ones).

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

Adding to 21110021000212 its reverse (21200012001112), we get a palindrome (42310033001324).

The spelling of 21110021000212 in words is "twenty-one trillion, one hundred ten billion, twenty-one million, two hundred twelve", and thus it is an aban number.