21401401440124 has 24 divisors (see below), whose sum is σ = 39366081504288. Its totient is φ = 10160741521920.

The previous prime is 21401401440113. The next prime is 21401401440127. The reversal of 21401401440124 is 42104410410412.

It is a junction number, because it is equal to n+sod(n) for n = 21401401440092 and 21401401440101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21401401440127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 848979837 + ... + 849005044.

It is an arithmetic number, because the mean of its divisors is an integer number (1640253396012).

Almost surely, 2^{21401401440124} is an apocalyptic number.

It is an amenable number.

21401401440124 is a deficient number, since it is larger than the sum of its proper divisors (17964680064164).

21401401440124 is a wasteful number, since it uses less digits than its factorization.

21401401440124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1697985045 (or 1697985043 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 28.

Adding to 21401401440124 its reverse (42104410410412), we get a palindrome (63505811850536).

The spelling of 21401401440124 in words is "twenty-one trillion, four hundred one billion, four hundred one million, four hundred forty thousand, one hundred twenty-four".