21220110212 has 24 divisors (see below), whose sum is σ = 42447069504. Its totient is φ = 9092865312.

The previous prime is 21220110211. The next prime is 21220110217. The reversal of 21220110212 is 21201102212.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (21220110211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125438 + ... + 241194.

It is an arithmetic number, because the mean of its divisors is an integer number (1768627896).

Almost surely, 2^21220110212 is an apocalyptic number.

It is an amenable number.

21220110212 is an abundant number, since it is smaller than the sum of its proper divisors (21226959292).

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

21220110212 is a wasteful number, since it uses less digits than its factorization.

21220110212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122315 (or 122313 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21220110212 its reverse (21201102212), we get a palindrome (42421212424).

It can be divided in two parts, 212201 and 10212, that multiplied together give a palindrome (2166996612).

The spelling of 21220110212 in words is "twenty-one billion, two hundred twenty million, one hundred ten thousand, two hundred twelve".