20021420243 has 12 divisors (see below), whose sum is σ = 22543777704. Its totient is φ = 17757352800.

The previous prime is 20021420219. The next prime is 20021420249. The reversal of 20021420243 is 34202412002.

It is not a de Polignac number, because 20021420243 - 2⁶ = 20021420179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021420249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2012921 + ... + 2022842.

It is an arithmetic number, because the mean of its divisors is an integer number (1878648142).

Almost surely, 2^20021420243 is an apocalyptic number.

20021420243 is a deficient number, since it is larger than the sum of its proper divisors (2522357461).

20021420243 is a wasteful number, since it uses less digits than its factorization.

20021420243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4035826 (or 4035815 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 20021420243 its reverse (34202412002), we get a palindrome (54223832245).

The spelling of 20021420243 in words is "twenty billion, twenty-one million, four hundred twenty thousand, two hundred forty-three".