21040223004242 has 32 divisors (see below), whose sum is σ = 35780586710400. Its totient is φ = 9198824946048.

The previous prime is 21040223004217. The next prime is 21040223004253. The reversal of 21040223004242 is 24240032204012.

It is a Harshad number since it is a multiple of its sum of digits (26).

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 in 15 ways as a sum of consecutive naturals, for example, 2610038 + ... + 6992334.

It is an arithmetic number, because the mean of its divisors is an integer number (1118143334700).

Almost surely, 2^{21040223004242} is an apocalyptic number.

21040223004242 is a deficient number, since it is larger than the sum of its proper divisors (14740363706158).

21040223004242 is a wasteful number, since it uses less digits than its factorization.

21040223004242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4392050.

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

Adding to 21040223004242 its reverse (24240032204012), we get a palindrome (45280255208254).

The spelling of 21040223004242 in words is "twenty-one trillion, forty billion, two hundred twenty-three million, four thousand, two hundred forty-two".