21140434124 has 12 divisors (see below), whose sum is σ = 37502551464. Its totient is φ = 10425419424.

The previous prime is 21140434079. The next prime is 21140434229. The reversal of 21140434124 is 42143404112.

It is a junction number, because it is equal to n+sod(n) for n = 21140434093 and 21140434102.

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, 36199082 + ... + 36199665.

It is an arithmetic number, because the mean of its divisors is an integer number (3125212622).

Almost surely, 2^21140434124 is an apocalyptic number.

It is an amenable number.

21140434124 is a deficient number, since it is larger than the sum of its proper divisors (16362117340).

21140434124 is a wasteful number, since it uses less digits than its factorization.

21140434124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72398824 (or 72398822 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21140434124 its reverse (42143404112), we get a palindrome (63283838236).

The spelling of 21140434124 in words is "twenty-one billion, one hundred forty million, four hundred thirty-four thousand, one hundred twenty-four".