21020400313144 has 16 divisors (see below), whose sum is σ = 39434226267600. Its totient is φ = 10504606641792.

The previous prime is 21020400313141. The next prime is 21020400313243. The reversal of 21020400313144 is 44131300402012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020400313141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 699173377 + ... + 699203440.

It is an arithmetic number, because the mean of its divisors is an integer number (2464639141725).

Almost surely, 2^{21020400313144} is an apocalyptic number.

It is an amenable number.

21020400313144 is a deficient number, since it is larger than the sum of its proper divisors (18413825954456).

21020400313144 is a wasteful number, since it uses less digits than its factorization.

21020400313144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398378702 (or 1398378698 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21020400313144 its reverse (44131300402012), we get a palindrome (65151700715156).

The spelling of 21020400313144 in words is "twenty-one trillion, twenty billion, four hundred million, three hundred thirteen thousand, one hundred forty-four".