20121443231 has 8 divisors (see below), whose sum is σ = 20248722480. Its totient is φ = 19994211072.

The previous prime is 20121443191. The next prime is 20121443233. The reversal of 20121443231 is 13234412102.

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 20121443231 - 2²² = 20117248927 is a prime.

It is a super-2 number, since 2×20121443231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20121443197 and 20121443206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121443233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1304975 + ... + 1320303.

It is an arithmetic number, because the mean of its divisors is an integer number (2531090310).

Almost surely, 2^20121443231 is an apocalyptic number.

20121443231 is a deficient number, since it is larger than the sum of its proper divisors (127279249).

20121443231 is a wasteful number, since it uses less digits than its factorization.

20121443231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23545.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 20121443231 its reverse (13234412102), we get a palindrome (33355855333).

The spelling of 20121443231 in words is "twenty billion, one hundred twenty-one million, four hundred forty-three thousand, two hundred thirty-one".