21004030123044 has 48 divisors (see below), whose sum is σ = 50334445525056. Its totient is φ = 6812055158400.

The previous prime is 21004030123031. The next prime is 21004030123051. The reversal of 21004030123044 is 44032103040012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91714159 + ... + 91942889.

It is an arithmetic number, because the mean of its divisors is an integer number (1048634281772).

Almost surely, 2^{21004030123044} is an apocalyptic number.

It is an amenable number.

21004030123044 is an abundant number, since it is smaller than the sum of its proper divisors (29330415402012).

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

21004030123044 is a wasteful number, since it uses less digits than its factorization.

21004030123044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435596 (or 435594 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21004030123044 its reverse (44032103040012), we get a palindrome (65036133163056).

The spelling of 21004030123044 in words is "twenty-one trillion, four billion, thirty million, one hundred twenty-three thousand, forty-four".