21040120322404 has 24 divisors (see below), whose sum is σ = 39388023927000. Its totient is φ = 9799158521856.

The previous prime is 21040120322341. The next prime is 21040120322423. The reversal of 21040120322404 is 40422302104012.

It can be written as a sum of positive squares in 4 ways, for example, as 8188239480100 + 12851880842304 = 2861510^2 + 3584952^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1594908529 + ... + 1594921720.

It is an arithmetic number, because the mean of its divisors is an integer number (1641167663625).

Almost surely, 2^{21040120322404} is an apocalyptic number.

It is an amenable number.

21040120322404 is a deficient number, since it is larger than the sum of its proper divisors (18347903604596).

21040120322404 is a wasteful number, since it uses less digits than its factorization.

21040120322404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3189830367 (or 3189830365 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21040120322404 its reverse (40422302104012), we get a palindrome (61462422426416).

The spelling of 21040120322404 in words is "twenty-one trillion, forty billion, one hundred twenty million, three hundred twenty-two thousand, four hundred four".