21202122112 has 32 divisors (see below), whose sum is σ = 42415394400. Its totient is φ = 10556689920.

The previous prime is 21202122091. The next prime is 21202122119. The reversal of 21202122112 is 21122120212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202122119) 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, 315939 + ... + 377122.

It is an arithmetic number, because the mean of its divisors is an integer number (1325481075).

Almost surely, 2^21202122112 is an apocalyptic number.

It is an amenable number.

21202122112 is an abundant number, since it is smaller than the sum of its proper divisors (21213272288).

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

21202122112 is an equidigital number, since it uses as much as digits as its factorization.

21202122112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693314 (or 693302 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21202122112 its reverse (21122120212), we get a palindrome (42324242324).

It can be divided in two parts, 2120212 and 2112, that multiplied together give a palindrome (4477887744).

The spelling of 21202122112 in words is "twenty-one billion, two hundred two million, one hundred twenty-two thousand, one hundred twelve".