20421420143 has 8 divisors (see below), whose sum is σ = 20675512416. Its totient is φ = 20168892000.

The previous prime is 20421420073. The next prime is 20421420169. The reversal of 20421420143 is 34102412402.

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

It is a cyclic number.

It is not a de Polignac number, because 20421420143 - 2¹⁰ = 20421419119 is a prime.

It is a super-2 number, since 2×20421420143² (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 (20421420743) 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, 364748 + ... + 416993.

It is an arithmetic number, because the mean of its divisors is an integer number (2584439052).

Almost surely, 2^20421420143 is an apocalyptic number.

20421420143 is a deficient number, since it is larger than the sum of its proper divisors (254092273).

20421420143 is a wasteful number, since it uses less digits than its factorization.

20421420143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782065.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 20421420143 its reverse (34102412402), we get a palindrome (54523832545).

The spelling of 20421420143 in words is "twenty billion, four hundred twenty-one million, four hundred twenty thousand, one hundred forty-three".