21123424134 has 40 divisors (see below), whose sum is σ = 47388836880. Its totient is φ = 7032703824.

The previous prime is 21123424121. The next prime is 21123424187. The reversal of 21123424134 is 43142432112.

21123424134 is a `hidden beast` number, since 2 + 11 + 234 + 2 + 413 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21123424098 and 21123424107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 58212 + ... + 213624.

It is an arithmetic number, because the mean of its divisors is an integer number (1184720922).

Almost surely, 2^21123424134 is an apocalyptic number.

21123424134 is an abundant number, since it is smaller than the sum of its proper divisors (26265412746).

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

21123424134 is a wasteful number, since it uses less digits than its factorization.

21123424134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156266 (or 156257 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 21123424134 its reverse (43142432112), we get a palindrome (64265856246).

The spelling of 21123424134 in words is "twenty-one billion, one hundred twenty-three million, four hundred twenty-four thousand, one hundred thirty-four".