21242032442 has 4 divisors (see below), whose sum is σ = 31863048666. Its totient is φ = 10621016220.

The previous prime is 21242032349. The next prime is 21242032459. The reversal of 21242032442 is 24423024212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19656320401 + 1585712041 = 140201^2 + 39821^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5310508109 + ... + 5310508112.

Almost surely, 2^21242032442 is an apocalyptic number.

21242032442 is a deficient number, since it is larger than the sum of its proper divisors (10621016224).

21242032442 is a wasteful number, since it uses less digits than its factorization.

21242032442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10621016223.

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 21242032442 its reverse (24423024212), we get a palindrome (45665056654).

The spelling of 21242032442 in words is "twenty-one billion, two hundred forty-two million, thirty-two thousand, four hundred forty-two".