20131021421 has 8 divisors (see below), whose sum is σ = 23008755264. Its totient is φ = 17253756000.

The previous prime is 20131021387. The next prime is 20131021433. The reversal of 20131021421 is 12412013102.

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 20131021421 - 2³⁰ = 19057279597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20131021421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131021451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19595 + ... + 201608.

It is an arithmetic number, because the mean of its divisors is an integer number (2876094408).

Almost surely, 2^20131021421 is an apocalyptic number.

It is an amenable number.

20131021421 is a deficient number, since it is larger than the sum of its proper divisors (2877733843).

20131021421 is a wasteful number, since it uses less digits than its factorization.

20131021421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234211.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20131021421 its reverse (12412013102), we get a palindrome (32543034523).

The spelling of 20131021421 in words is "twenty billion, one hundred thirty-one million, twenty-one thousand, four hundred twenty-one".