20121424434 has 96 divisors (see below), whose sum is σ = 48784412160. Its totient is φ = 6141816576.

The previous prime is 20121424391. The next prime is 20121424481. The reversal of 20121424434 is 43442412102.

20121424434 is a `hidden beast` number, since 2 + 0 + 1 + 214 + 2 + 443 + 4 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 20121424398 and 20121424407.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 559999 + ... + 594845.

It is an arithmetic number, because the mean of its divisors is an integer number (508170960).

Almost surely, 2^20121424434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20121424434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24392206080).

20121424434 is an abundant number, since it is smaller than the sum of its proper divisors (28662987726).

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

20121424434 is a wasteful number, since it uses less digits than its factorization.

20121424434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34929 (or 34906 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 20121424434 its reverse (43442412102), we get a palindrome (63563836536).

The spelling of 20121424434 in words is "twenty billion, one hundred twenty-one million, four hundred twenty-four thousand, four hundred thirty-four".