21102204042 has 48 divisors (see below), whose sum is σ = 48142654560. Its totient is φ = 6661802016.

The previous prime is 21102204041. The next prime is 21102204073. The reversal of 21102204042 is 24040220112.

It is a super-2 number, since 2×21102204042² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21102204041) 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, 1414273 + ... + 1429115.

It is an arithmetic number, because the mean of its divisors is an integer number (1002971970).

Almost surely, 2^21102204042 is an apocalyptic number.

21102204042 is an abundant number, since it is smaller than the sum of its proper divisors (27040450518).

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

21102204042 is a wasteful number, since it uses less digits than its factorization.

21102204042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19027 (or 19024 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21102204042 its reverse (24040220112), we get a palindrome (45142424154).

The spelling of 21102204042 in words is "twenty-one billion, one hundred two million, two hundred four thousand, forty-two".