20013124421 has 8 divisors (see below), whose sum is σ = 21196110744. Its totient is φ = 18830776320.

The previous prime is 20013124399. The next prime is 20013124433. The reversal of 20013124421 is 12442131002.

It can be written as a sum of positive squares in 4 ways, for example, as 1338535396 + 18674589025 = 36586^2 + 136655^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20013124421 - 2⁶ = 20013124357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20013124393 and 20013124402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013124451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94220 + ... + 221141.

It is an arithmetic number, because the mean of its divisors is an integer number (2649513843).

Almost surely, 2^20013124421 is an apocalyptic number.

It is an amenable number.

20013124421 is a deficient number, since it is larger than the sum of its proper divisors (1182986323).

20013124421 is a wasteful number, since it uses less digits than its factorization.

20013124421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319111.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20013124421 its reverse (12442131002), we get a palindrome (32455255423).

The spelling of 20013124421 in words is "twenty billion, thirteen million, one hundred twenty-four thousand, four hundred twenty-one".