20032121231 has 4 divisors (see below), whose sum is σ = 20178341232. Its totient is φ = 19885901232.

The previous prime is 20032121209. The next prime is 20032121233. The reversal of 20032121231 is 13212123002.

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

It is a cyclic number.

It is not a de Polignac number, because 20032121231 - 2³⁴ = 2852252047 is a prime.

It is a super-2 number, since 2×20032121231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20032121233) 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, 73109795 + ... + 73110068.

It is an arithmetic number, because the mean of its divisors is an integer number (5044585308).

Almost surely, 2^20032121231 is an apocalyptic number.

20032121231 is a deficient number, since it is larger than the sum of its proper divisors (146220001).

20032121231 is a wasteful number, since it uses less digits than its factorization.

20032121231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146220000.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20032121231 its reverse (13212123002), we get a palindrome (33244244233).

The spelling of 20032121231 in words is "twenty billion, thirty-two million, one hundred twenty-one thousand, two hundred thirty-one".