21232342242 has 56 divisors (see below), whose sum is σ = 48173874444. Its totient is φ = 7014760704.

The previous prime is 21232342211. The next prime is 21232342249. The reversal of 21232342242 is 24224323212.

21232342242 is a `hidden beast` number, since 2 + 1 + 232 + 3 + 422 + 4 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20454434361 + 777907881 = 143019^2 + 27891^2 .

It is a super-3 number, since 3×21232342242³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21232342249) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 100318 + ... + 229190.

Almost surely, 2^21232342242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21232342242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24086937222).

21232342242 is an abundant number, since it is smaller than the sum of its proper divisors (26941532202).

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

21232342242 is a wasteful number, since it uses less digits than its factorization.

21232342242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129006 (or 128991 counting only the distinct ones).

The product of its digits is 9216, while the sum is 27.

Adding to 21232342242 its reverse (24224323212), we get a palindrome (45456665454).

The spelling of 21232342242 in words is "twenty-one billion, two hundred thirty-two million, three hundred forty-two thousand, two hundred forty-two".