20121434124 has 144 divisors (see below), whose sum is σ = 56528085600. Its totient is φ = 5540648960.

The previous prime is 20121434119. The next prime is 20121434143. The reversal of 20121434124 is 42143412102.

It is a super-2 number, since 2×20121434124² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20121434094 and 20121434103.

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, 701782 + ... + 729890.

It is an arithmetic number, because the mean of its divisors is an integer number (392556150).

Almost surely, 2^20121434124 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20121434124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28264042800).

20121434124 is an abundant number, since it is smaller than the sum of its proper divisors (36406651476).

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

20121434124 is a wasteful number, since it uses less digits than its factorization.

20121434124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28184 (or 28171 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 20121434124 its reverse (42143412102), we get a palindrome (62264846226).

The spelling of 20121434124 in words is "twenty billion, one hundred twenty-one million, four hundred thirty-four thousand, one hundred twenty-four".