20132243921 has 4 divisors (see below), whose sum is σ = 20260474932. Its totient is φ = 20004012912.

The previous prime is 20132243909. The next prime is 20132243947. The reversal of 20132243921 is 12934223102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9577558225 + 10554685696 = 97865^2 + 102736^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20132243921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20132245921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64115270 + ... + 64115583.

It is an arithmetic number, because the mean of its divisors is an integer number (5065118733).

Almost surely, 2^20132243921 is an apocalyptic number.

It is an amenable number.

20132243921 is a deficient number, since it is larger than the sum of its proper divisors (128231011).

20132243921 is a wasteful number, since it uses less digits than its factorization.

20132243921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128231010.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 20132243921 in words is "twenty billion, one hundred thirty-two million, two hundred forty-three thousand, nine hundred twenty-one".