21011020211112 has 16 divisors (see below), whose sum is σ = 52527550527840. Its totient is φ = 7003673403696.

The previous prime is 21011020211099. The next prime is 21011020211113. The reversal of 21011020211112 is 21111202011012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21011020211091 and 21011020211100.

It is not an unprimeable number, because it can be changed into a prime (21011020211113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 437729587708 + ... + 437729587755.

It is an arithmetic number, because the mean of its divisors is an integer number (3282971907990).

Almost surely, 2^{21011020211112} is an apocalyptic number.

It is an amenable number.

21011020211112 is an abundant number, since it is smaller than the sum of its proper divisors (31516530316728).

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

21011020211112 is a wasteful number, since it uses less digits than its factorization.

21011020211112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875459175472 (or 875459175468 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21011020211112 its reverse (21111202011012), we get a palindrome (42122222222124).

The spelling of 21011020211112 in words is "twenty-one trillion, eleven billion, twenty million, two hundred eleven thousand, one hundred twelve".