20112232421 has 4 divisors (see below), whose sum is σ = 20761014144. Its totient is φ = 19463450700.

The previous prime is 20112232417. The next prime is 20112232463. The reversal of 20112232421 is 12423221102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20112232421 - 2² = 20112232417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20112232393 and 20112232402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112232411) 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 3 ways as a sum of consecutive naturals, for example, 324390815 + ... + 324390876.

It is an arithmetic number, because the mean of its divisors is an integer number (5190253536).

Almost surely, 2^20112232421 is an apocalyptic number.

It is an amenable number.

20112232421 is a deficient number, since it is larger than the sum of its proper divisors (648781723).

20112232421 is an equidigital number, since it uses as much as digits as its factorization.

20112232421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648781722.

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

Adding to 20112232421 its reverse (12423221102), we get a palindrome (32535453523).

The spelling of 20112232421 in words is "twenty billion, one hundred twelve million, two hundred thirty-two thousand, four hundred twenty-one".