21144122202 has 48 divisors (see below), whose sum is σ = 49267321632. Its totient is φ = 6031982880.

The previous prime is 21144122201. The next prime is 21144122213. The reversal of 21144122202 is 20222144112.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21144122201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 139933 + ... + 248735.

It is an arithmetic number, because the mean of its divisors is an integer number (1026402534).

Almost surely, 2^21144122202 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21144122202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24633660816).

21144122202 is an abundant number, since it is smaller than the sum of its proper divisors (28123199430).

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

21144122202 is a wasteful number, since it uses less digits than its factorization.

21144122202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109483 (or 109476 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21144122202 its reverse (20222144112), we get a palindrome (41366266314).

The spelling of 21144122202 in words is "twenty-one billion, one hundred forty-four million, one hundred twenty-two thousand, two hundred two".