21012101112 has 32 divisors (see below), whose sum is σ = 52589796480. Its totient is φ = 6996094560.

The previous prime is 21012101093. The next prime is 21012101251. The reversal of 21012101112 is 21110121012.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 474564 + ... + 516947.

It is an arithmetic number, because the mean of its divisors is an integer number (1643431140).

Almost surely, 2^21012101112 is an apocalyptic number.

It is an amenable number.

21012101112 is an abundant number, since it is smaller than the sum of its proper divisors (31577695368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21012101112 is a wasteful number, since it uses less digits than its factorization.

21012101112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992403 (or 992399 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21012101112 its reverse (21110121012), we get a palindrome (42122222124).

The spelling of 21012101112 in words is "twenty-one billion, twelve million, one hundred one thousand, one hundred twelve".