21232112242 has 12 divisors (see below), whose sum is σ = 35006664798. Its totient is φ = 9650960000.

The previous prime is 21232112207. The next prime is 21232112303. The reversal of 21232112242 is 24221123212.

It can be written as a sum of positive squares in only one way, i.e., 19267938481 + 1964173761 = 138809^2 + 44319^2 .

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43867759 + ... + 43868242.

Almost surely, 2^21232112242 is an apocalyptic number.

21232112242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21232112242 is a deficient number, since it is larger than the sum of its proper divisors (13774552556).

21232112242 is a wasteful number, since it uses less digits than its factorization.

21232112242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87736025 (or 87736014 counting only the distinct ones).

The product of its digits is 768, while the sum is 22.

Adding to 21232112242 its reverse (24221123212), we get a palindrome (45453235454).

The spelling of 21232112242 in words is "twenty-one billion, two hundred thirty-two million, one hundred twelve thousand, two hundred forty-two".