21404440124 has 12 divisors (see below), whose sum is σ = 37459388904. Its totient is φ = 10701757584.

The previous prime is 21404440073. The next prime is 21404440181. The reversal of 21404440124 is 42104440412.

It is a super-2 number, since 2×21404440124² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21404440093 and 21404440102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1754 + ... + 206910.

It is an arithmetic number, because the mean of its divisors is an integer number (3121615742).

Almost surely, 2^21404440124 is an apocalyptic number.

It is an amenable number.

21404440124 is a deficient number, since it is larger than the sum of its proper divisors (16054948780).

21404440124 is a wasteful number, since it uses less digits than its factorization.

21404440124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231244 (or 231242 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 26.

Adding to 21404440124 its reverse (42104440412), we get a palindrome (63508880536).

The spelling of 21404440124 in words is "twenty-one billion, four hundred four million, four hundred forty thousand, one hundred twenty-four".