21210220101112 has 64 divisors (see below), whose sum is σ = 46518417031680. Its totient is φ = 8876604868992.

The previous prime is 21210220101107. The next prime is 21210220101127. The reversal of 21210220101112 is 21110102201212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9205693 + ... + 11276755.

It is an arithmetic number, because the mean of its divisors is an integer number (726850266120).

Almost surely, 2^{21210220101112} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21210220101112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23259208515840).

21210220101112 is an abundant number, since it is smaller than the sum of its proper divisors (25308196930568).

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

21210220101112 is a wasteful number, since it uses less digits than its factorization.

21210220101112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2075372 (or 2075368 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21210220101112 its reverse (21110102201212), we get a palindrome (42320322302324).

The spelling of 21210220101112 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty million, one hundred one thousand, one hundred twelve".