20042242421 has 8 divisors (see below), whose sum is σ = 20572913088. Its totient is φ = 19513564000.

The previous prime is 20042242351. The next prime is 20042242453. The reversal of 20042242421 is 12424224002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20042242421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20042242471) 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, 477665 + ... + 517926.

It is an arithmetic number, because the mean of its divisors is an integer number (2571614136).

Almost surely, 2^20042242421 is an apocalyptic number.

It is an amenable number.

20042242421 is a deficient number, since it is larger than the sum of its proper divisors (530670667).

20042242421 is an equidigital number, since it uses as much as digits as its factorization.

20042242421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996123.

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 20042242421 its reverse (12424224002), we get a palindrome (32466466423).

The spelling of 20042242421 in words is "twenty billion, forty-two million, two hundred forty-two thousand, four hundred twenty-one".