20123022421 has 4 divisors (see below), whose sum is σ = 20406445344. Its totient is φ = 19839599500.

The previous prime is 20123022419. The next prime is 20123022431. The reversal of 20123022421 is 12422032102.

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 20123022421 - 2¹ = 20123022419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123022431) 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, 141711355 + ... + 141711496.

It is an arithmetic number, because the mean of its divisors is an integer number (5101611336).

Almost surely, 2^20123022421 is an apocalyptic number.

It is an amenable number.

20123022421 is a deficient number, since it is larger than the sum of its proper divisors (283422923).

20123022421 is an equidigital number, since it uses as much as digits as its factorization.

20123022421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283422922.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20123022421 its reverse (12422032102), we get a palindrome (32545054523).

The spelling of 20123022421 in words is "twenty billion, one hundred twenty-three million, twenty-two thousand, four hundred twenty-one".